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Question

(A) $SAN$ (Sinoatrial node) generates an action potential that stimulates both the atria $(A)$ to undergo a simultaneous contraction known as atrial s

Vedclass · Accepted Answer

$A-$atria,$B-$atrial systole,$C-30$

Vedclass · Answer

(A) $SAN$ (Sinoatrial node) generates an action potential that stimulates both the atria $(A)$ to undergo a simultaneous contraction known as atrial systole $(B)$. This contraction increases the flow of blood into the ventricles by approximately $30$ percent $(C)$.$1$. The heart is myogenic,meaning the heartbeat originates from an electrical impulse generated by the $SA$ node.$2$. The $SA$ node is located in the wall of the right atrium and acts as the pacemaker,firing at about $72$ times per minute.$3$. The impulse spreads across the atria,causing them to contract (atrial systole),which pushes blood into the ventricles.$4$. This atrial contraction contributes an additional $30\%$ of blood volume to the ventricles beyond what flows passively.

Column-$I$	Column-$II$
$P$. Interatrial septum	$I$. Thick fibrous tissue
$Q$. Interventricular septum	$II$. Thin wall
$R$. Atrioventricular septum	$III$. Thick wall

$SAN$ generates an action potential which stimulates both the $A$ to undergo a simultaneous contraction called $B$. This increases the flow of the blood into the ventricles by about $C$ percentage. Choose the correct option for $A, B$ and $C$.

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Column-$I$ Column-$II$

$P$. Interatrial septum $I$. Thick fibrous tissue

$Q$. Interventricular septum $II$. Thin wall

$R$. Atrioventricular septum $III$. Thick wall

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