Biology 2015

The coelom of an earthworm, the muscular foot of a clam, and the trunk of an elephant can all be considered what type of skeleton?
a. exoskeleton
b. hydrostatic
c. jointed
d. longitudinal

Which type of animal has an exoskeleton?
a. arthropod
b. cnidarian
c. earthworm
d. primate

Which of the following characteristics is not an advantage of a jointed vertebrate endoskeleton?
a. allows flexible movement
b. grows with the animal
c. guards against dessication
d. protects vital internal organs

The human skeletal system does not
a. produce blood cells.
b. store minerals.
c. help produce movement.
d. store fat.
e. produce body heat

Spongy bone
a. is a storage area for fat.
b. contains red bone marrow, where blood cells are formed.
c. lends strength to bones.
d. Both b and c are correct

Which of the following is not a bone of the appendicular skeleton?
a. the scapula
b. a rib
c. a metatarsal bone
d. the patella
e. the ulna

The vertebrae that articulate with the ribs are the
a. lumbar vertebrae.
b. sacral vertebrae.
c. thoracic vertebrae.
d. cervical vertebrae.
e. coccyx.

ulna
match each bone to the location in the key
a. upper arm
b. forearm
c. pectoral girdle
d. pelvic girdle
e. thigh
f. lower leg

tibia
match each bone to the location in the key
a. upper arm
b. forearm
c. pectoral girdle
d. pelvic girdle
e. thigh
f. lower leg

clavicle
match each bone to the location in the key
a. upper arm
b. forearm
c. pectoral girdle
d. pelvic girdle
e. thigh
f. lower leg

femur
match each bone to the location in the key
a. upper arm
b. forearm
c. pectoral girdle
d. pelvic girdle
e. thigh
f. lower leg

In a muscle fiber,
a. the sarcolemma is connective tissue holding the myofibrils together.
b. the sarcoplasmic reticulum stores calcium.
c. both myosin and actin filaments have cross-bridges.
d. there is a T system but no endoplasmic reticulum.
e. All of these are correct.

According to the sliding filament model, when muscles contract,
a. sarcomeres shorten.
b. myosin heads break down ATP.
c. actin slides past myosin.
d. the H zone disappears.
e. All of these are correct.

Nervous stimulation of muscles
a. occurs at a neuromuscular junction.
b. involves the release of ACh.
c. results in impulses that travel down the T system.
d. causes calcium to be released from the sarcoplasmic reticulum.
e. All of these are correct

Acetylcholine
a. is active at somatic synapses but not at neuromuscular junctions.
b. binds to receptors in the sarcolemma.
c. precedes the buildup of ATP in mitochondria.
d. is stored in the sarcoplasmic reticulum.
e. Both b and d are correct.

Label this diagram of a muscle fiber, using these terms: myofibril, Z line, T tubule, sarcomere, sarcolemma, sarcoplasmic reticulum.