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Questions and Answers
What is the velocity of signal conduction in cardiac muscle fibers?
What is the velocity of signal conduction in cardiac muscle fibers?
- 5 to 6 m/sec
- 10 to 12 m/sec
- 1 to 2 m/sec
- 0.3 to 0.5 m/sec (correct)
How does the velocity of signal conduction in cardiac muscle fibers compare to that in very large nerve fibers?
How does the velocity of signal conduction in cardiac muscle fibers compare to that in very large nerve fibers?
- Approximately 1/100
- Approximately 1/10
- Approximately 1/50
- Approximately 1/250 (correct)
What is the velocity of conduction in the specialized heart conduction system (Purkinje fibers)?
What is the velocity of conduction in the specialized heart conduction system (Purkinje fibers)?
- 6 m/sec
- 4 m/sec (correct)
- 8 m/sec
- 10 m/sec
What characterizes the refractory period of cardiac muscle?
What characterizes the refractory period of cardiac muscle?
What is the normal refractory period of the ventricle in cardiac muscle?
What is the normal refractory period of the ventricle in cardiac muscle?
What is the main function of excitation-contraction coupling in muscle cells?
What is the main function of excitation-contraction coupling in muscle cells?
How does the refractory period of atrial muscle compare to that of ventricles?
How does the refractory period of atrial muscle compare to that of ventricles?
What is the role of calcium ions in the excitation-contraction coupling of cardiac muscle?
What is the role of calcium ions in the excitation-contraction coupling of cardiac muscle?
How does the action potential spread within a cardiac muscle fiber?
How does the action potential spread within a cardiac muscle fiber?
Which structure releases calcium ions into the muscle sarcoplasm in cardiac muscle cells?
Which structure releases calcium ions into the muscle sarcoplasm in cardiac muscle cells?
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