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Questions and Answers
What is the source of the electrical stimulus that initiates the heart's beating?
What is the function of the ventricles in the heart?
What is the role of the bundle of His in the cardiac conduction system?
Where does the electrical impulse travel after leaving the SA node?
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Which part of the heart is known as the natural pacemaker?
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Which chamber of the heart is particularly constructed to work as pressure pump?
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What is the normal range of electrical stimulus generation by the sinus node per minute under normal conditions?
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Where does the electrical impulse travel after leaving the atrioventricular node?
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Which part of the heart represents one heartbeat with each contraction of the ventricles?
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What is the function of the SA node in the heart's electrical conduction system?
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Study Notes
Cardiac Conduction System
- The SA node (Sinus Node) is the source of the electrical stimulus that initiates the heart's beating, and it is known as the natural pacemaker.
- The SA node generates electrical stimuli at a normal range of 60-100 per minute under normal conditions.
Ventricles
- The ventricles are particularly constructed to work as pressure pumps, pumping blood out of the heart.
Bundle of His
- The bundle of His is a part of the cardiac conduction system that transmits the electrical impulse from the atrioventricular node to the ventricles.
Cardiac Conduction Pathway
- After leaving the SA node, the electrical impulse travels to the atrioventricular node.
- After leaving the atrioventricular node, the electrical impulse travels to the bundle of His, and then to the ventricles.
- A single heartbeat represents one contraction of the ventricles.
SA Node Function
- The SA node's function is to generate electrical stimuli and regulate the heart's rhythm.
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Description
Test your knowledge on the electrical properties of the heart, including the origin and spread of cardiac excitation, properties of cardiac muscle, and action potentials. Learn about the dynamic, electrically activated, chemically sensitive, and mechanical pump with a regular rhythm.
