MUSCLE
CARDIAC MUSCLE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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to prevent atrium and ventricle from contracting at the same time
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to prevent blood too much flowing from atrium to ventricle
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to make sure that all valves are open before blood sent out from heart
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to make sure there is enough time for atrium to receive blood from veins
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Detailed explanation-1: -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. The atria are the heart’s upper chambers. They receive blood from your body and empty it into the ventricles.
Detailed explanation-2: -Why is it necessary to direct the electrical signals through the AV node? Blood is pumped out of the ventricles through openings at the top of the chambers. If electrical signals from the atria were conducted directly into the ventricles, the ventricles would start contracting at the top.
Detailed explanation-3: -If you have heart block, the electrical signal does not travel through the AV node to the ventricles. The result is a heart that doesn’t function effectively, meaning your heart beats slowly or skips beats and it can’t pump blood through its chambers and out to the body as a normal heart would.