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Skeletal and Smooth Muscle Contraction

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Questions and Answers

What is the function of the sarcoplasmic reticulum in muscle contraction?

Synthesizing actin and myosin filaments

Generating energy for muscle movement

Transporting ions for muscle relaxation

Releasing calcium ions for muscle contraction (correct)

What is the name of the cell membrane of a muscle fiber?

Sarcoplasm

Myofibril

Sarcomere

Sarcolemma (correct)

What are the small projections from the sides of the myosin called?

Z discs

Cross-bridges (correct)

Actin filaments

Sarcomeres

What gives myofibrils their striated appearance?

Interdigitation of myosin and actin filaments Signup and view all the answers

What is the portion of the myofibril that lies between two successive Z discs called?

Sarcomere Signup and view all the answers

What is the main source of energy required for the walk-along mechanism during muscle contraction?

The concentration of ATP in the muscle fiber Signup and view all the answers

What happens to the actin filaments during muscle contraction?

They pull inward among the myosin filaments to their maximum extent Signup and view all the answers

What role does acetylcholine play in muscle excitation?

It binds to the Ach-gated channels and opens the channel Signup and view all the answers

How long can the concentration of ATP in the muscle fiber maintain full contraction?

1 to 2 seconds Signup and view all the answers

What is the function of transverse tubules (T-tubules) during excitation-contraction coupling?

Transmission of action potential to deeper regions of the muscle fiber Signup and view all the answers