Chapter 11, Muscular Tissue Video Solutions, Anatomy and Physiology

Problem 1

To make a muscle contract more strongly, the nerwous system can activate more motor units. This process is called
a. recruitment.
b. summation.
c. incomplete tetanus.
d. twitch.
e. concentric contraction.

Joanna Quigley

Numerade Educator

09:04

Problem 2

The functionsl unit of a muscle fiber is the a segment from ane $Z$ dixe to the next.
a. mysfibrill
b. I bund
c. sarcomere
d. neuromuseular junction
e. striation

Scott Rhodes

Numerade Educator

00:48

Problem 3

Before a skeletal muscle fiber can contract, ATP must bind to
a. a $Z$ dise.
b. the myasin head.
c. tropomyosin.
d. troponin.
c. actin.

Joanna Quigley

Numerade Educator

01:30

Problem 4

Before a skeletal musele fiber can contract, $\mathrm{Ca}^{2+}$ must bind to
a. Calsequestrin.
b. calmodulin.
c. the mycosin head.
d. troponin.
c. actin.

Caroline Jones

Numerade Educator

Problem 5

Which of the following musele proteins is mar intracellular?
a. actin
b. mydosin
?. collagen
d. troponin
e. dystrophin

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02:00

Problem 6

Smooth muscle cells have whereas skeletal muscle fibers do not.
a. sarcoplasmic reticulum
b. troponyosin
c. calmodulin
d. $Z$ dises
e. myosin ATPase

Rikhil Makwana

Numerade Educator

00:49

Problem 7

ACh receptors are found mainly in
a. synaptic vesicles.
b. terminal cisterns.
c. thick filaments.
d. thin filamsents.
e. junctional folds.

Rikhil Makwana

Numerade Educator

01:55

Problem 8

Unitary smooth muscle cells can stimulate each other because they have
a. a latch-bridge.
b. diffuse junctions.
c. gap junctions.
d. tight junctions.
e. cross-bridges.

Joanna Quigley

Numerade Educator

01:01

Problem 9

A person with a high $\mathrm{Vo}_{2} \max$
a. needs less oxygen than someone with a low $\mathrm{Vo}_{2}$ max.
b. has stronger museles than someone with a Lone $\mathrm{Vo}_{2} \mathrm{max}$.
c. is less likely to show muscle tetamus than someone with a low $\mathrm{Vo}_{2}$ max.
d. has fewer muscle mitochondria than someone with a low $\mathrm{Vo}_{2}$ max.
e. experiences less muscle fatigue during exercise than someone with a low Vo_max.

Narayan Hari

Numerade Educator

01:29

Problem 10

Slow oxidative fibers have all of the following except
a. an abundance of myoglobin.
b. an abundance of glycogen.
c. high fatigue resistance.
d. a red color.
e. a high capacity to synthesize ATP aerobically.