1. Skeletal muscles are able to generate their greatest force during a contracti

ID: 3476995 • Letter: 1

Question

1. Skeletal muscles are able to generate their greatest force during a contraction when their length is ______ of their normal resting length.

A. 100-120%

B. 50-60%

C. 150%-175%

D. 75-80%

2. An action potential enters a muscle cell _______.

A. by the sarcolemma

B. by diffusion

C. by the sarcoplasmic reticulum

D. by the T-tubules

E. by the actin myofilament

3. What structures do the calcium ions bind to when muscle contraction is initiated?

A. the troponin molecule

B. the actin myofilament

C. the sarcoplasmic reticulum

D. the tropomyosin molecule

E. the sarcolemma

4. Cross bridges form between___________.

A. calcium and sodium

B. troponin and tropomyosin

C. the T-tubules and the sarcolemma

D. the actin filaments and myosin heads

E. the sarcolemma and the sarcoplasmic reticulum

.1. The answer is: A. 100-120%

Skeletal muscles are able to generate their greatest force during a contraction when their length is 100-120% of their normal resting length.

The optimum length of sarcomere to generate their greatest force during a contraction is 100 - 120 % of their normal resting length.

2. The answer is: A. by the sarcolemma

The action potential generated move along the sarcolemma of the muscle fiber.

3. The answer is: A. the troponin molecule

The calcium ions bind to troponin molecule resulting in power stroke.

4. The answer is: D. the actin filaments and myosin heads

Power stroke is accomplished when cross bridge is formed between actin filaments and myosin heads.

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