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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?
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?
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?
What happens to the actin filaments during muscle contraction?
What happens to the actin filaments during muscle contraction?
What role does acetylcholine play in muscle excitation?
What role does acetylcholine play in muscle excitation?
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?
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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