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Questions and Answers
What is the function of the sarcoplasmic reticulum in muscle contraction?
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?
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?
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?
What gives myofibrils their striated appearance?
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What is the portion of the myofibril that lies between two successive Z discs called?
What is the portion of the myofibril that lies between two successive Z discs called?
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What is the main source of energy required for the walk-along mechanism during muscle contraction?
What is the main source of energy required for the walk-along mechanism during muscle contraction?
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What happens to the actin filaments during muscle contraction?
What happens to the actin filaments during muscle contraction?
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What role does acetylcholine play in muscle excitation?
What role does acetylcholine play in muscle excitation?
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How long can the concentration of ATP in the muscle fiber maintain full contraction?
How long can the concentration of ATP in the muscle fiber maintain full contraction?
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What is the function of transverse tubules (T-tubules) during excitation-contraction coupling?
What is the function of transverse tubules (T-tubules) during excitation-contraction coupling?
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