ANATOMY
CHEST AND CARDIOVASCULAR
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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False
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True
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Either A or B
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None of the above
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Detailed explanation-1: -Action potentials generated cyclically by the SA node spread around the right atrium and left atrium, causing them to contract, forcing their contents into the ventricles. This wave of depolarisation then reaches the atrioventricular node (AV node) which is the entry point for action potentials to the ventricles.
Detailed explanation-2: -The atrioventricular node delays the SA node’s electrical signal. It delays the signal by a consistent amount of time (a fraction of a second) each time. The delay ensures that your atria are empty of blood before the contraction stops.
Detailed explanation-3: -The delaying an electric impulse through the atrioventricular node (AV node) allows atria to completely empty themselves into the ventricle for contraction before the blood pumps out through ventricles.