Human Anatomy and Physiology

John W. Hole

Chapter 9

The Muscular System - all with Video Answers

Educators

Chapter Questions

Problem 1

Match the muscles in column I with the descriptions and functions in column II.
A. Inserted on the coronoid process of the mandible
B. Draws the corner of the mouth upward
C. Can raise and adduct the scapula
D. Can pull the head into an upright position
E. Consists of two parts the frontalis and the occipitalis
F. Compresses the cheeks.
G. Extends over the neck from the chest to the face
H. Pulls the jaw to the side in grinding movements.
L Primary extensor of the elbow
J. Pulls the shoulder back and downward
K. Abducts the arm
L. Rotates the arm laterally
M. Pulls the arm forward and across the chest
N Rotates the arm medially
O. Strongest flexor of the elbow
$P$. Strongest supinator of the forearm.
Q. Inverts the foot
R. A member of the quadriceps femoris group
S. A plantar flexor of the foot
T. Compresses the contents of the abdominal cavity.
U. Heaviest muscle in the body.
V A hamstring muscle.
W Adducts the thigh.
X Abducts the thigh.
Buccinator

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Problem 1

List the general functions of muscles.

Joanna Quigley

Numerade Educator

Problem 2

Identify the general locations of skeletal, smooth, and cardiac muscle tissues.

Mariana Roldan

Numerade Educator

Problem 2

Match the muscles in column I with the descriptions and functions in column II.
A. Inserted on the coronoid process of the mandible
B. Draws the corner of the mouth upward
C. Can raise and adduct the scapula
D. Can pull the head into an upright position
E. Consists of two parts the frontalis and the occipitalis
F. Compresses the cheeks.
G. Extends over the neck from the chest to the face
H. Pulls the jaw to the side in grinding movements.
L Primary extensor of the elbow
J. Pulls the shoulder back and downward
K. Abducts the arm
L. Rotates the arm laterally
M. Pulls the arm forward and across the chest
N Rotates the arm medially
O. Strongest flexor of the elbow
$P$. Strongest supinator of the forearm.
Q. Inverts the foot
R. A member of the quadriceps femoris group
S. A plantar flexor of the foot
T. Compresses the contents of the abdominal cavity.
U. Heaviest muscle in the body.
V A hamstring muscle.
W Adducts the thigh.
X Abducts the thigh.
Epicranius

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Problem 3

Match the muscles in column I with the descriptions and functions in column II.
A. Inserted on the coronoid process of the mandible
B. Draws the corner of the mouth upward
C. Can raise and adduct the scapula
D. Can pull the head into an upright position
E. Consists of two parts the frontalis and the occipitalis
F. Compresses the cheeks.
G. Extends over the neck from the chest to the face
H. Pulls the jaw to the side in grinding movements.
L Primary extensor of the elbow
J. Pulls the shoulder back and downward
K. Abducts the arm
L. Rotates the arm laterally
M. Pulls the arm forward and across the chest
N Rotates the arm medially
O. Strongest flexor of the elbow
$P$. Strongest supinator of the forearm.
Q. Inverts the foot
R. A member of the quadriceps femoris group
S. A plantar flexor of the foot
T. Compresses the contents of the abdominal cavity.
U. Heaviest muscle in the body.
V A hamstring muscle.
W Adducts the thigh.
X Abducts the thigh.
Medial pterygoid

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Problem 3

Distinguish between fascia and aponeurosis.

Joanna Quigley

Numerade Educator

Problem 4

Match the muscles in column I with the descriptions and functions in column II.
A. Inserted on the coronoid process of the mandible
B. Draws the corner of the mouth upward
C. Can raise and adduct the scapula
D. Can pull the head into an upright position
E. Consists of two parts the frontalis and the occipitalis
F. Compresses the cheeks.
G. Extends over the neck from the chest to the face
H. Pulls the jaw to the side in grinding movements.
L Primary extensor of the elbow
J. Pulls the shoulder back and downward
K. Abducts the arm
L. Rotates the arm laterally
M. Pulls the arm forward and across the chest
N Rotates the arm medially
O. Strongest flexor of the elbow
$P$. Strongest supinator of the forearm.
Q. Inverts the foot
R. A member of the quadriceps femoris group
S. A plantar flexor of the foot
T. Compresses the contents of the abdominal cavity.
U. Heaviest muscle in the body.
V A hamstring muscle.
W Adducts the thigh.
X Abducts the thigh.
Platysma

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Problem 4

List the major parts of a skeletal muscle fiber and describe the function of each part.

Andrei Demkov

Numerade Educator

Problem 5

Match the muscles in column I with the descriptions and functions in column II.
A. Inserted on the coronoid process of the mandible
B. Draws the corner of the mouth upward
C. Can raise and adduct the scapula
D. Can pull the head into an upright position
E. Consists of two parts the frontalis and the occipitalis
F. Compresses the cheeks.
G. Extends over the neck from the chest to the face
H. Pulls the jaw to the side in grinding movements.
L Primary extensor of the elbow
J. Pulls the shoulder back and downward
K. Abducts the arm
L. Rotates the arm laterally
M. Pulls the arm forward and across the chest
N Rotates the arm medially
O. Strongest flexor of the elbow
$P$. Strongest supinator of the forearm.
Q. Inverts the foot
R. A member of the quadriceps femoris group
S. A plantar flexor of the foot
T. Compresses the contents of the abdominal cavity.
U. Heaviest muscle in the body.
V A hamstring muscle.
W Adducts the thigh.
X Abducts the thigh.
Rhomboideus major

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Problem 5

Describe a neuromuscular junction and a neurotransmitter substance.

Sam Limsuwannarot

Sam Limsuwannarot

Numerade Educator

Problem 6

Define motor unit and explain how the number of fibers within a unit affects muscular contractions.

Qudsiya Anis

Numerade Educator

Problem 6

Match the muscles in column I with the descriptions and functions in column II.
A. Inserted on the coronoid process of the mandible
B. Draws the corner of the mouth upward
C. Can raise and adduct the scapula
D. Can pull the head into an upright position
E. Consists of two parts the frontalis and the occipitalis
F. Compresses the cheeks.
G. Extends over the neck from the chest to the face
H. Pulls the jaw to the side in grinding movements.
L Primary extensor of the elbow
J. Pulls the shoulder back and downward
K. Abducts the arm
L. Rotates the arm laterally
M. Pulls the arm forward and across the chest
N Rotates the arm medially
O. Strongest flexor of the elbow
$P$. Strongest supinator of the forearm.
Q. Inverts the foot
R. A member of the quadriceps femoris group
S. A plantar flexor of the foot
T. Compresses the contents of the abdominal cavity.
U. Heaviest muscle in the body.
V A hamstring muscle.
W Adducts the thigh.
X Abducts the thigh.
Splenius capitus

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Problem 7

Describe the major events that occur when a muscle fiber contracts.

Qudsiya Anis

Numerade Educator

Problem 7

Match the muscles in column I with the descriptions and functions in column II.
A. Inserted on the coronoid process of the mandible
B. Draws the corner of the mouth upward
C. Can raise and adduct the scapula
D. Can pull the head into an upright position
E. Consists of two parts the frontalis and the occipitalis
F. Compresses the cheeks.
G. Extends over the neck from the chest to the face
H. Pulls the jaw to the side in grinding movements.
L Primary extensor of the elbow
J. Pulls the shoulder back and downward
K. Abducts the arm
L. Rotates the arm laterally
M. Pulls the arm forward and across the chest
N Rotates the arm medially
O. Strongest flexor of the elbow
$P$. Strongest supinator of the forearm.
Q. Inverts the foot
R. A member of the quadriceps femoris group
S. A plantar flexor of the foot
T. Compresses the contents of the abdominal cavity.
U. Heaviest muscle in the body.
V A hamstring muscle.
W Adducts the thigh.
X Abducts the thigh.
Temporalis

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Problem 8

Match the muscles in column I with the descriptions and functions in column II.
A. Inserted on the coronoid process of the mandible
B. Draws the corner of the mouth upward
C. Can raise and adduct the scapula
D. Can pull the head into an upright position
E. Consists of two parts the frontalis and the occipitalis
F. Compresses the cheeks.
G. Extends over the neck from the chest to the face
H. Pulls the jaw to the side in grinding movements.
L Primary extensor of the elbow
J. Pulls the shoulder back and downward
K. Abducts the arm
L. Rotates the arm laterally
M. Pulls the arm forward and across the chest
N Rotates the arm medially
O. Strongest flexor of the elbow
$P$. Strongest supinator of the forearm.
Q. Inverts the foot
R. A member of the quadriceps femoris group
S. A plantar flexor of the foot
T. Compresses the contents of the abdominal cavity.
U. Heaviest muscle in the body.
V A hamstring muscle.
W Adducts the thigh.
X Abducts the thigh.
Zygomaticus

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Problem 8

Explain how ATP and creatine phosphate are related and how these substances function in the muscle fiber contraction mechanism.

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Problem 9

Match the muscles in column I with the descriptions and functions in column II.
A. Inserted on the coronoid process of the mandible
B. Draws the corner of the mouth upward
C. Can raise and adduct the scapula
D. Can pull the head into an upright position
E. Consists of two parts the frontalis and the occipitalis
F. Compresses the cheeks.
G. Extends over the neck from the chest to the face
H. Pulls the jaw to the side in grinding movements.
L Primary extensor of the elbow
J. Pulls the shoulder back and downward
K. Abducts the arm
L. Rotates the arm laterally
M. Pulls the arm forward and across the chest
N Rotates the arm medially
O. Strongest flexor of the elbow
$P$. Strongest supinator of the forearm.
Q. Inverts the foot
R. A member of the quadriceps femoris group
S. A plantar flexor of the foot
T. Compresses the contents of the abdominal cavity.
U. Heaviest muscle in the body.
V A hamstring muscle.
W Adducts the thigh.
X Abducts the thigh.
Biceps brachii

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Problem 9

Describe how oxygen is supplied to muscles.

Sara Vukojevic

Numerade Educator

Problem 10

Match the muscles in column I with the descriptions and functions in column II.
A. Inserted on the coronoid process of the mandible
B. Draws the corner of the mouth upward
C. Can raise and adduct the scapula
D. Can pull the head into an upright position
E. Consists of two parts the frontalis and the occipitalis
F. Compresses the cheeks.
G. Extends over the neck from the chest to the face
H. Pulls the jaw to the side in grinding movements.
L Primary extensor of the elbow
J. Pulls the shoulder back and downward
K. Abducts the arm
L. Rotates the arm laterally
M. Pulls the arm forward and across the chest
N Rotates the arm medially
O. Strongest flexor of the elbow
$P$. Strongest supinator of the forearm.
Q. Inverts the foot
R. A member of the quadriceps femoris group
S. A plantar flexor of the foot
T. Compresses the contents of the abdominal cavity.
U. Heaviest muscle in the body.
V A hamstring muscle.
W Adducts the thigh.
X Abducts the thigh.
Brachialis

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Problem 10

Describe how oxygen debt may develop.

Jessica Honkomp

Jessica Honkomp

Numerade Educator

Problem 11

Match the muscles in column I with the descriptions and functions in column II.
A. Inserted on the coronoid process of the mandible
B. Draws the corner of the mouth upward
C. Can raise and adduct the scapula
D. Can pull the head into an upright position
E. Consists of two parts the frontalis and the occipitalis
F. Compresses the cheeks.
G. Extends over the neck from the chest to the face
H. Pulls the jaw to the side in grinding movements.
L Primary extensor of the elbow
J. Pulls the shoulder back and downward
K. Abducts the arm
L. Rotates the arm laterally
M. Pulls the arm forward and across the chest
N Rotates the arm medially
O. Strongest flexor of the elbow
$P$. Strongest supinator of the forearm.
Q. Inverts the foot
R. A member of the quadriceps femoris group
S. A plantar flexor of the foot
T. Compresses the contents of the abdominal cavity.
U. Heaviest muscle in the body.
V A hamstring muscle.
W Adducts the thigh.
X Abducts the thigh.
Deltoid

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Problem 11

Explain how muscles may become fatigued and how a person's physical condition may affect tolerance to fatigue.

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Problem 12

Match the muscles in column I with the descriptions and functions in column II.
A. Inserted on the coronoid process of the mandible
B. Draws the corner of the mouth upward
C. Can raise and adduct the scapula
D. Can pull the head into an upright position
E. Consists of two parts the frontalis and the occipitalis
F. Compresses the cheeks.
G. Extends over the neck from the chest to the face
H. Pulls the jaw to the side in grinding movements.
L Primary extensor of the elbow
J. Pulls the shoulder back and downward
K. Abducts the arm
L. Rotates the arm laterally
M. Pulls the arm forward and across the chest
N Rotates the arm medially
O. Strongest flexor of the elbow
$P$. Strongest supinator of the forearm.
Q. Inverts the foot
R. A member of the quadriceps femoris group
S. A plantar flexor of the foot
T. Compresses the contents of the abdominal cavity.
U. Heaviest muscle in the body.
V A hamstring muscle.
W Adducts the thigh.
X Abducts the thigh.
Latissimus dorsi

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Problem 12

Define threshold stimulus.

Devin Lea

Numerade Educator

Problem 13

Explain what is meant by an all-or-none response.

Courtney Burson

Courtney Burson

Numerade Educator

Problem 13

Match the muscles in column I with the descriptions and functions in column II.
A. Inserted on the coronoid process of the mandible
B. Draws the corner of the mouth upward
C. Can raise and adduct the scapula
D. Can pull the head into an upright position
E. Consists of two parts the frontalis and the occipitalis
F. Compresses the cheeks.
G. Extends over the neck from the chest to the face
H. Pulls the jaw to the side in grinding movements.
L Primary extensor of the elbow
J. Pulls the shoulder back and downward
K. Abducts the arm
L. Rotates the arm laterally
M. Pulls the arm forward and across the chest
N Rotates the arm medially
O. Strongest flexor of the elbow
$P$. Strongest supinator of the forearm.
Q. Inverts the foot
R. A member of the quadriceps femoris group
S. A plantar flexor of the foot
T. Compresses the contents of the abdominal cavity.
U. Heaviest muscle in the body.
V A hamstring muscle.
W Adducts the thigh.
X Abducts the thigh.
Pectoralis major

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Problem 14

Sketch a myogram of a single muscular twitch and identify the latent period, period of contraction, and period of relaxation.

Qudsiya Anis

Numerade Educator

Problem 14

Match the muscles in column I with the descriptions and functions in column II.
A. Inserted on the coronoid process of the mandible
B. Draws the corner of the mouth upward
C. Can raise and adduct the scapula
D. Can pull the head into an upright position
E. Consists of two parts the frontalis and the occipitalis
F. Compresses the cheeks.
G. Extends over the neck from the chest to the face
H. Pulls the jaw to the side in grinding movements.
L Primary extensor of the elbow
J. Pulls the shoulder back and downward
K. Abducts the arm
L. Rotates the arm laterally
M. Pulls the arm forward and across the chest
N Rotates the arm medially
O. Strongest flexor of the elbow
$P$. Strongest supinator of the forearm.
Q. Inverts the foot
R. A member of the quadriceps femoris group
S. A plantar flexor of the foot
T. Compresses the contents of the abdominal cavity.
U. Heaviest muscle in the body.
V A hamstring muscle.
W Adducts the thigh.
X Abducts the thigh.
Pronator teres

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Problem 15

Match the muscles in column I with the descriptions and functions in column II.
A. Inserted on the coronoid process of the mandible
B. Draws the corner of the mouth upward
C. Can raise and adduct the scapula
D. Can pull the head into an upright position
E. Consists of two parts the frontalis and the occipitalis
F. Compresses the cheeks.
G. Extends over the neck from the chest to the face
H. Pulls the jaw to the side in grinding movements.
L Primary extensor of the elbow
J. Pulls the shoulder back and downward
K. Abducts the arm
L. Rotates the arm laterally
M. Pulls the arm forward and across the chest
N Rotates the arm medially
O. Strongest flexor of the elbow
$P$. Strongest supinator of the forearm.
Q. Inverts the foot
R. A member of the quadriceps femoris group
S. A plantar flexor of the foot
T. Compresses the contents of the abdominal cavity.
U. Heaviest muscle in the body.
V A hamstring muscle.
W Adducts the thigh.
X Abducts the thigh.
Teres minor

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Problem 15

Define refractory period.

Courtney Burson

Courtney Burson

Numerade Educator

Problem 16

Match the muscles in column I with the descriptions and functions in column II.
A. Inserted on the coronoid process of the mandible
B. Draws the corner of the mouth upward
C. Can raise and adduct the scapula
D. Can pull the head into an upright position
E. Consists of two parts the frontalis and the occipitalis
F. Compresses the cheeks.
G. Extends over the neck from the chest to the face
H. Pulls the jaw to the side in grinding movements.
L Primary extensor of the elbow
J. Pulls the shoulder back and downward
K. Abducts the arm
L. Rotates the arm laterally
M. Pulls the arm forward and across the chest
N Rotates the arm medially
O. Strongest flexor of the elbow
$P$. Strongest supinator of the forearm.
Q. Inverts the foot
R. A member of the quadriceps femoris group
S. A plantar flexor of the foot
T. Compresses the contents of the abdominal cavity.
U. Heaviest muscle in the body.
V A hamstring muscle.
W Adducts the thigh.
X Abducts the thigh.
Triceps brachii

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Problem 16

Explain how a skeletal muscle can be stimulated to produce a sustained contraction.

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Problem 17

Match the muscles in column I with the descriptions and functions in column II.
A. Inserted on the coronoid process of the mandible
B. Draws the corner of the mouth upward
C. Can raise and adduct the scapula
D. Can pull the head into an upright position
E. Consists of two parts the frontalis and the occipitalis
F. Compresses the cheeks.
G. Extends over the neck from the chest to the face
H. Pulls the jaw to the side in grinding movements.
L Primary extensor of the elbow
J. Pulls the shoulder back and downward
K. Abducts the arm
L. Rotates the arm laterally
M. Pulls the arm forward and across the chest
N Rotates the arm medially
O. Strongest flexor of the elbow
$P$. Strongest supinator of the forearm.
Q. Inverts the foot
R. A member of the quadriceps femoris group
S. A plantar flexor of the foot
T. Compresses the contents of the abdominal cavity.
U. Heaviest muscle in the body.
V A hamstring muscle.
W Adducts the thigh.
X Abducts the thigh.
Biceps femoris

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Problem 17

Distinguish between tetanic contraction and muscle tone.

Gaurav Priyank

Numerade Educator

Problem 18

Match the muscles in column I with the descriptions and functions in column II.
A. Inserted on the coronoid process of the mandible
B. Draws the corner of the mouth upward
C. Can raise and adduct the scapula
D. Can pull the head into an upright position
E. Consists of two parts the frontalis and the occipitalis
F. Compresses the cheeks.
G. Extends over the neck from the chest to the face
H. Pulls the jaw to the side in grinding movements.
L Primary extensor of the elbow
J. Pulls the shoulder back and downward
K. Abducts the arm
L. Rotates the arm laterally
M. Pulls the arm forward and across the chest
N Rotates the arm medially
O. Strongest flexor of the elbow
$P$. Strongest supinator of the forearm.
Q. Inverts the foot
R. A member of the quadriceps femoris group
S. A plantar flexor of the foot
T. Compresses the contents of the abdominal cavity.
U. Heaviest muscle in the body.
V A hamstring muscle.
W Adducts the thigh.
X Abducts the thigh.
External oblique

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Problem 18

Distinguish between isometric and isotonic contractions and explain how each is used in body movements.

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Problem 19

Match the muscles in column I with the descriptions and functions in column II.
A. Inserted on the coronoid process of the mandible
B. Draws the corner of the mouth upward
C. Can raise and adduct the scapula
D. Can pull the head into an upright position
E. Consists of two parts the frontalis and the occipitalis
F. Compresses the cheeks.
G. Extends over the neck from the chest to the face
H. Pulls the jaw to the side in grinding movements.
L Primary extensor of the elbow
J. Pulls the shoulder back and downward
K. Abducts the arm
L. Rotates the arm laterally
M. Pulls the arm forward and across the chest
N Rotates the arm medially
O. Strongest flexor of the elbow
$P$. Strongest supinator of the forearm.
Q. Inverts the foot
R. A member of the quadriceps femoris group
S. A plantar flexor of the foot
T. Compresses the contents of the abdominal cavity.
U. Heaviest muscle in the body.
V A hamstring muscle.
W Adducts the thigh.
X Abducts the thigh.
Gastrocnemius

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Problem 19

Distinguish between hypertrophy and atrophy and explain how each may be caused.

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Problem 20

Match the muscles in column I with the descriptions and functions in column II.
A. Inserted on the coronoid process of the mandible
B. Draws the corner of the mouth upward
C. Can raise and adduct the scapula
D. Can pull the head into an upright position
E. Consists of two parts the frontalis and the occipitalis
F. Compresses the cheeks.
G. Extends over the neck from the chest to the face
H. Pulls the jaw to the side in grinding movements.
L Primary extensor of the elbow
J. Pulls the shoulder back and downward
K. Abducts the arm
L. Rotates the arm laterally
M. Pulls the arm forward and across the chest
N Rotates the arm medially
O. Strongest flexor of the elbow
$P$. Strongest supinator of the forearm.
Q. Inverts the foot
R. A member of the quadriceps femoris group
S. A plantar flexor of the foot
T. Compresses the contents of the abdominal cavity.
U. Heaviest muscle in the body.
V A hamstring muscle.
W Adducts the thigh.
X Abducts the thigh.
Gluteus maximus

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Problem 20

Compare the structures of a smooth and a skeletal muscle fiber.

Mariana Roldan

Numerade Educator

Problem 21

Match the muscles in column I with the descriptions and functions in column II.
A. Inserted on the coronoid process of the mandible
B. Draws the corner of the mouth upward
C. Can raise and adduct the scapula
D. Can pull the head into an upright position
E. Consists of two parts the frontalis and the occipitalis
F. Compresses the cheeks.
G. Extends over the neck from the chest to the face
H. Pulls the jaw to the side in grinding movements.
L Primary extensor of the elbow
J. Pulls the shoulder back and downward
K. Abducts the arm
L. Rotates the arm laterally
M. Pulls the arm forward and across the chest
N Rotates the arm medially
O. Strongest flexor of the elbow
$P$. Strongest supinator of the forearm.
Q. Inverts the foot
R. A member of the quadriceps femoris group
S. A plantar flexor of the foot
T. Compresses the contents of the abdominal cavity.
U. Heaviest muscle in the body.
V A hamstring muscle.
W Adducts the thigh.
X Abducts the thigh.
Gluteus medius

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Problem 21

Distinguish between multiunit and visceral smooth muscles.

Joanna Quigley

Numerade Educator

Problem 22

Match the muscles in column I with the descriptions and functions in column II.
A. Inserted on the coronoid process of the mandible
B. Draws the corner of the mouth upward
C. Can raise and adduct the scapula
D. Can pull the head into an upright position
E. Consists of two parts the frontalis and the occipitalis
F. Compresses the cheeks.
G. Extends over the neck from the chest to the face
H. Pulls the jaw to the side in grinding movements.
L Primary extensor of the elbow
J. Pulls the shoulder back and downward
K. Abducts the arm
L. Rotates the arm laterally
M. Pulls the arm forward and across the chest
N Rotates the arm medially
O. Strongest flexor of the elbow
$P$. Strongest supinator of the forearm.
Q. Inverts the foot
R. A member of the quadriceps femoris group
S. A plantar flexor of the foot
T. Compresses the contents of the abdominal cavity.
U. Heaviest muscle in the body.
V A hamstring muscle.
W Adducts the thigh.
X Abducts the thigh.
Gracilis

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Problem 22

Define peristalsis and explain its function.

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Problem 23

Match the muscles in column I with the descriptions and functions in column II.
A. Inserted on the coronoid process of the mandible
B. Draws the corner of the mouth upward
C. Can raise and adduct the scapula
D. Can pull the head into an upright position
E. Consists of two parts the frontalis and the occipitalis
F. Compresses the cheeks.
G. Extends over the neck from the chest to the face
H. Pulls the jaw to the side in grinding movements.
L Primary extensor of the elbow
J. Pulls the shoulder back and downward
K. Abducts the arm
L. Rotates the arm laterally
M. Pulls the arm forward and across the chest
N Rotates the arm medially
O. Strongest flexor of the elbow
$P$. Strongest supinator of the forearm.
Q. Inverts the foot
R. A member of the quadriceps femoris group
S. A plantar flexor of the foot
T. Compresses the contents of the abdominal cavity.
U. Heaviest muscle in the body.
V A hamstring muscle.
W Adducts the thigh.
X Abducts the thigh.
Rectus femoris

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Problem 23

Compare the characteristics of smooth and skeletal muscle contractions.

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Problem 24

Match the muscles in column I with the descriptions and functions in column II.
A. Inserted on the coronoid process of the mandible
B. Draws the corner of the mouth upward
C. Can raise and adduct the scapula
D. Can pull the head into an upright position
E. Consists of two parts the frontalis and the occipitalis
F. Compresses the cheeks.
G. Extends over the neck from the chest to the face
H. Pulls the jaw to the side in grinding movements.
L Primary extensor of the elbow
J. Pulls the shoulder back and downward
K. Abducts the arm
L. Rotates the arm laterally
M. Pulls the arm forward and across the chest
N Rotates the arm medially
O. Strongest flexor of the elbow
$P$. Strongest supinator of the forearm.
Q. Inverts the foot
R. A member of the quadriceps femoris group
S. A plantar flexor of the foot
T. Compresses the contents of the abdominal cavity.
U. Heaviest muscle in the body.
V A hamstring muscle.
W Adducts the thigh.
X Abducts the thigh.
Tibialis anterior

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Problem 24

Compare the structures of cardiac and skeletal muscles.

Dennis Howard

Numerade Educator

Problem 25

Distinguish between a muscle's origin and its insertion.

Nilma Khan

Numerade Educator

Problem 26

Define prime mover, synergist, and antagonist

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