Question

why there is no direct transmission of cardiac impulse from atrium to ventricles

don't copy from Google​

Answer 1

Answer:

1. The SA node (called the pacemaker of the heart) sends out an electrical impulse.
2. The upper heart chambers (atria) contract.
3. The AV node sends an impulse into the ventricles.
4. The lower heart chambers (ventricles) contract or pump.
5. The SA node sends another signal to the atria to contract, which starts the cycle over again.

Explanation:

• This cycle of an electrical signal followed by a contraction is one heartbeat.  
• SA node and atria  
• When the SA node sends an electrical impulse, it triggers the following process:

1. The electrical signal travels from your SA node through muscle cells in your right and left atria.
2. The signal triggers the muscle cells that make your atria contract.
3. The atria contract, pumping blood into your left and right ventricles.

Answer 2

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The atrioventricular (AV) node is a second clump of specialized myocardial conductive cells, located in the inferior portion of the right atrium within the atrioventricular septum. The septum prevents the impulse from spreading directly to the ventricles without passing through the AV node.

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