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Questions and Answers
What is the role of calcium ions in muscle contraction?
What is the role of calcium ions in muscle contraction?
- Activate myosin cross bridges to attach to actin (correct)
- Promote the breakdown of ATP in muscle cells
- Prevent the sliding of myosin along the actin filaments
- Inhibit myosin cross bridges from attaching to actin
What is the common reason for muscle fatigue?
What is the common reason for muscle fatigue?
- Lack of actin-binding sites
- High levels of calcium ions
- Excess ATP production
- Oxygen debt (correct)
What happens when a muscle is unable to contract even when stimulated?
What happens when a muscle is unable to contract even when stimulated?
- Muscle fatigue (correct)
- Reduced calcium ion levels
- Enhanced actin-binding capacity
- Excessive ATP production
How does accumulation of lactic acid affect muscle contraction?
How does accumulation of lactic acid affect muscle contraction?
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What is the role of acetylcholine (ACh) in muscle contraction?
What is the role of acetylcholine (ACh) in muscle contraction?
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What happens at the peak of depolarization in the muscle cell?
What happens at the peak of depolarization in the muscle cell?
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What causes hyperpolarization in the muscle cell?
What causes hyperpolarization in the muscle cell?
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What is the function of the sodium-potassium pump in muscle cells?
What is the function of the sodium-potassium pump in muscle cells?
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What is the consequence of reaching the threshold potential (-55mV) in the muscle cell?
What is the consequence of reaching the threshold potential (-55mV) in the muscle cell?
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