Body Fluids And Circulation Question 22
Question: The purpose of the AV node is to __ and the purpose of the Purkinje fibres is to__.
Options:
A) Create simultaneous atrial and ventricular depolarisation; speed up transmission of the cardiac impulse into the ventricle.
B) Delay ventricular depolarisation relative to atrial depolarisation; insulate the cardiac impulse from the general ventricular fibres.
C) Delay ventricular depolarisation relative to atrial depolarisation; transmit the cardiac impulse to very small localised groups of ventricular fibres.
D) Delay atrial depolarisation relative to ventricular depolarisation; transmit the cardiac impulse to very small localized groups of ventricular fibres.
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Answer:
Correct Answer: C
Solution:
[c] The AV node delays the ventricular depolarisation relative to atrial depolarisation, so atrial contraction occurs before ventricular contraction.
The Purkinje fibres transmit the cardiac impulse to very small localised groups of ventricular fibres.
BETA
