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Questions and Answers
What is the primary role of the sinoatrial node (SAN) in the heart?
What is the primary role of the sinoatrial node (SAN) in the heart?
- It acts as the pacemaker of the heart. (correct)
- It conducts the impulse to the atrioventricular bundle.
- It blends with ordinary ventricular muscle fibers.
- It serves as a blood reservoir during ventricular systole.
Which layer of the heart wall is located on the outermost side?
Which layer of the heart wall is located on the outermost side?
- Pericardium
- Epicardium (correct)
- Myocardium
- Endocardium
What causes the depolarization in the action potential of cardiac muscle?
What causes the depolarization in the action potential of cardiac muscle?
- Increased permeability to sodium ions. (correct)
- A transient change in resting membrane potential.
- Reactivation of the sodium-potassium pump.
- Increased permeability to calcium ions.
What function do the atria perform during ventricular systole?
What function do the atria perform during ventricular systole?
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Which statement correctly describes the function of the AV bundle of His?
Which statement correctly describes the function of the AV bundle of His?
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What is the primary function of the ventricles in the heart?
What is the primary function of the ventricles in the heart?
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Which property of cardiac muscle allows it to respond to an adequate stimulus?
Which property of cardiac muscle allows it to respond to an adequate stimulus?
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Which statement about the autonomic innervation of cardiac muscle is true?
Which statement about the autonomic innervation of cardiac muscle is true?
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What is the significance of intercalated discs in cardiac muscle?
What is the significance of intercalated discs in cardiac muscle?
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Which term describes the ability of cardiac muscle fibers to generate regular impulses without neural stimulation?
Which term describes the ability of cardiac muscle fibers to generate regular impulses without neural stimulation?
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