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Anatomy & Physiology 1 > Chapter 9 Quiz Show > Flashcards

Chapter 9 Quiz Show Flashcards

1
Q

What is the functional unit of a skeletal muscle termed?
a. The sarcomere
b. The A band
c. The myofibril
d. The sarcolemma

A

a. the sarcomere

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2
Q

A sheet-like extension of the epimysium is called a(n) ________.
a. aponeurosis
b. fascicle
c. sarcoplasmic reticulum
d. tendon

A

a. aponeurosis

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3
Q

Thick filaments are found in the ________ of the sarcomere.
a. Z disc
b. I band
c. A band
d. All of the above contain thick
filaments.

A

c. a band

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4
Q

In a resting muscle cell, the myosin-binding sites are blocked by ________.
a. actin
b. troponin
c. titin
d. tropomyosin

A

d. tropomyosin

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5
Q

T tubules are an extension of the ___________.
a. sarcomere
b. sarcoplasmic reticulum
c. sarcolemma
d. endomysium

A

c. sarcolemma

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6
Q

When a muscle cell is at rest, most of the intracellular calcium is found stored in the ___________.
a. sarcoplasm
b. T tubule
c. sarcoplasmic reticulum
d. myosin heads

A

c. sarcoplasmic reticulum

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7
Q

Calcium ions will bind to ________ when present in the sarcoplasm.
a. myosin heads
b. ATP
c. myosin-binding sites
d. troponin

A

d. troponin

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8
Q

What substance must bind to myosin heads in order for the heads to detach from the thin filaments?
a. Calcium
b. ATP
c. Troponin
d. Sodium

A

b. ATP

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9
Q

Calcium is released from the terminal cisterns in response to ______.
a. ATP
b. calcium pumps
c. an action potential
d. troponin

A

c. an action potential

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10
Q

How does calcium reenter the terminal cisterns after muscle contraction is finished?
a. Diffusion
b. Active transport
c. Filtration
d. Endocytosis

A

b. active transport

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11
Q

A single contraction in response to a single threshold stimulus is defined as _________.
a. summation
b. tetany
c. treppe
d. a twitch

A

d. a twitch

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12
Q

The force exerted by a contracting muscle is __________.
a. muscle summation
b. muscle twitch
c. muscle tension
d. muscle load

A

c. muscle tension

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13
Q

The time that elapses between the stimulation of a muscle and the contraction of that muscle is defined as the _______.
a. depolarization period
b. latent period
c. recruitment period
d. refractory period

A

b. latent period

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14
Q

Which is NOT a factor that affects the force of muscle contraction?
a. Relative size of muscle fibers
b. Number of muscle fibers stimulated
c. Degree of muscle stretch
d. Method of muscle stimulation

A

d. method of muscle stimulation

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15
Q

Skeletal muscle contractions increase in strength because of ___________.
a. incomplete tetany
b. recruitment of motor units
c. an increase in threshold stimulus
d. increasing the number of twitches

A

b. recruitment of motor units

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16
Q

The energy source that is used directly for muscle contraction is ______.
a. ATP
b. glucose
c. creatine phosphate
d. fatty acids

A

a. ATP

17
Q

Muscle soreness may be due in part to which pathway of ATP production?
a. Phosphorylation
b. Aerobic respiration
c. Anaerobic glycolysis
d. Oxidation

A

c. anaerobic glycolysis

18
Q

After about 30 minutes of exercise, which substance becomes the major source of fuel?
a. Glucose
b. Pyruvic acid
c. Fatty acid
d. Lactic acid

A

c. fatty acid

19
Q

Which activity would be most dependent upon creatine?
a. Tennis
b. Soccer
c. Jogging
d. Diving

A

d. diving

20
Q

Which term refers to the length of time a muscle can continue to contract using aerobic pathways?
a. Aerobic threshold
b. Anaerobic threshold
c. Aerobic endurance
d. Anaerobic endurance

A

c. aerobic endurance

21
Q

Contraction of which sheet of smooth muscle results in shortening of the organ?
a. Circular layer
b. Transverse layer
c. Longitudinal layer
d. Square layer

A

c. longitudinal layer

22
Q

Smooth muscle cells can contract as a unit because of the presence of __________.
a. dense bodies
b. gap junctions
c. diffuse junctions
d. motor end plates

A

b. gap junctions

23
Q

Calcium binds to this substance in smooth muscle contraction.
a. Troponin
b. Calmodulin
c. ATP
d. Myosin kinase

A

b. calmodulin

24
Q

Smooth muscle contains ________ that correspond to the Z discs of skeletal muscle.
a. dense bodies
b. varicosities
c. diffuse junctions
d. gap junctions

A

a. dense bodies

25
Q

What unique characteristic of smooth muscle allows your stomach to stretch as you eat and
NOT contract immediately to expel food?
a. Hyperplasia
b. Slow contraction
c. Single-unit contraction
d. Stress-relaxation response

A

d. stress-relaxation response

26
Q

Which of the following is a characteristic of slow oxidative muscle fibers?
a. Large diameter
b. Few mitochondria
c. High myoglobin content
d. Poor blood supply

A

c. high myoglobin content

Anatomy & Physiology 1 (18 decks)

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