Question

#2 Answer parts A, B, C, and D to get credit for question 2

A. This type of protein is found in thin filaments and plays a direct role in interacting with thick filaments

1. Actin

2. Myosin

3. Sacromyosin

4. Trophomyosin

5. troponin

B. Which statement is most accurate about motor units?

1. A motor unit consists of several motor neurons and multiple muscle fibers

2. Asynchronous recruitment of motor unit promotes fatigue

3. Increased tension within a muscle is countered by increased motor unit recruitment

4. Fatigue resistant motor units are recruited before fatigable motor units

5. Fibers from one motor unit are clustered within a muscle

C. Anaerobic cellular respiration function in the muscle cell is to ____.

1. Hydrolyze ATP into ADP and Pi

2. Produce small amount of ATP in the absence of oxygen

Answer 1

Answer 2

Answer A:

The right choice is: Actin

Explanation: Actin found in thin filaments interacts with myosin found in thick filaments to cause sliding over each other which causes muscles to contract.

Answer B:

The right choice is: Fatigue resistant motor units are recruited before fatigable motor units

Explanation: CNS does orderly recruitment of motor units. Slow twitch muscles(type I) which do not fatigue fast are recruited before fast twitch muscles(type II) which fatigue fast.

Answer C:

The right choice is: Produce small amount of ATP in the absence of oxygen

Explanation: Anaerobic cellular respiration takes place in absence of oxygen which produces small amount of ATP like in Glycolysis.