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Identify the correct statement regarding the functions of the AV node and Purkinje fibers in the heart:
The AV node creates simultaneous atrial and ventricular depolarization while the Purkinje fibers speed up the transmission of the cardiac impulse into the ventricle.
The AV node delays ventricular depolarization relative to atrial depolarization, while the Purkinje fibers insulate the cardiac impulse from the general ventricular fibers.
The AV node delays ventricular depolarization relative to atrial depolarization, while the Purkinje fibers transmit the cardiac impulse to very small localized groups of ventricular fibers.
The AV node delays atrial depolarization relative to ventricular depolarization, while the Purkinje fibers transmit the cardiac impulse to very small localized groups of ventricular fibers.
Answers (1)
The correct statement is that the AV node delays ventricular depolarization relative to atrial depolarization, while the Purkinje fibers transmit the cardiac impulse to very small localized groups of ventricular fibers. The AV node acts as a gatekeeper, allowing a brief delay in the electrical signal to ensure proper coordination between the atria and ventricles. On the other hand, the Purkinje fibers rapidly transmit the electrical signal to ensure synchronized and efficient contraction of the ventricles. This combination of functions allows for the effective pumping of blood throughout the body.
Therefore, the correct answer is option 3.
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