ANATOMY
LYMPHATIC SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Spread impulse to Bundle of His, branches of Bundle of His to the apex of heart and to Purkinje fibers.
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Delay the impulse from SA node for about 0.1 second
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Generate impulse and spread it to wall of both atrium
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Allow the ventricles to contract
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Detailed explanation-1: -The purpose of this structure is to connect the electrical systems of the atria and the ventricles, providing electrical impedance from the atria and an intrinsic pacemaker in its absence.
Detailed explanation-2: -The AV node conducts the impulse into the two lower chambers of the heart (the ventricles). A heart block occurs if the transmission of the impulse between the AV node and the ventricles is interrupted. A heart block does not mean that the heart stops beating altogether, because other ‘back-up’ systems can take over.
Detailed explanation-3: -The SA (sinoatrial) node generates an electrical signal that causes the upper heart chambers (atria) to contract. The signal then passes through the AV (atrioventricular) node to the lower heart chambers (ventricles), causing them to contract, or pump.