Use your knowledge of muscle physiology to find the right word to match each def

Question

Use your knowledge of muscle physiology to find the right word to match each definition.

Question 1 options:

Enzyme responsible for stopping the signal in the neuromuscular junction

Thin contractile protein involved in cross-bridge formation, associated with troponin.

Located on the SR and, once opened, allows Ca2+ flow from the SR into the sarcoplasm

A channel in the muscle cell membrane, activated upon depolarization, which links depolarization with calcium release.

Thick contractile protein involved in cross-bridge formation, has binding sites for ATP

The ion responsible for depolarizing the muscle membrane by traveling through the nicotinic ACh receptor.

actin

sodium

DHPR

RyR

Myosin

Acetylcholinesterase

Potassium

Titin

Question 2 (1 point)

How does exposure to sarin or sarin-like chemical affect Ca2+ levels inside the sarcoplasmic reticulum? Why?

Question 2 options:

-The amount of Ca2+ in the SR increases because DHPR remains closed.

-The amount of Ca2+ in the SR increases because RyR remains opened.

-The amount of Ca2+ in the SR decreases because RyR remains opened.

-The amount of Ca2+ in the SR remains the same.

-The amount of Ca2+ in the SR increases because calcium-pumping ATPase works more efficiently.

-The amount of Ca2+ in the SR decreases because DHPR remains opened.

Question 3 (1 point)

In temporal summation, what is the difference between unfused and fused tetanus?

Question 3 options:

-In fused tetanus, larger motor units are recruited

-In fused tetanus, tension in the muscle fiber is lower than in unfused tetanus

-In fused tetanus, myosin and actin overlap optimally

-Fused tetanus results from stimuli of lower frequency than unfused tetanus.

In fused tetanus, more calcium flows out of the SR

Question 4 (1 point)

Given that axe throwing is a "sport" that requires short (2-3 seconds) powerful movements, which type of muscle fibers and energy substrate is Jeff primarily using?

Question 4 options:

-Type I, aerobic respiration

-Type I, phosphocreatine

-Type I, anaerobic glycolysis

-Type IIX, aerobic respiration

-Type IIX, phosphocreatine

-Type IIX, anaerobic glycolysis

Enzyme responsible for stopping the signal in the neuromuscular junction

Thin contractile protein involved in cross-bridge formation, associated with troponin.

Located on the SR and, once opened, allows Ca2+ flow from the SR into the sarcoplasm

A channel in the muscle cell membrane, activated upon depolarization, which links depolarization with calcium release.

Thick contractile protein involved in cross-bridge formation, has binding sites for ATP

The ion responsible for depolarizing the muscle membrane by traveling through the nicotinic ACh receptor.

1.

actin

2.

sodium

3.

DHPR

4.

RyR

5.

Myosin

6.

Acetylcholinesterase

7.

Potassium

8.

Titin

Explanation / Answer

1.

Enzyme responsible for stopping the signal in the neuromuscular junction - 6. Acetylcholinesterase

Thin contractile protein involved in cross-bridge formation, associated with troponin. 1. Actin

Located on the SR and, once opened, allows Ca2+ flow from the SR into the sarcoplasm - 4. RyR

A channel in the muscle cell membrane, activated upon depolarization, which links depolarization with calcium release - 3. DHPR

Thick contractile protein involved in cross-bridge formation, has binding sites for ATP - 5. Myosin

The ion responsible for depolarizing the muscle membrane by traveling through the nicotinic ACh receptor - 2. Sodium

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