Since it is the sinu-auricular node which ini | vedclass

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(D) The heart of a mammal is called $Myogenic$ because the contraction is initiated by a specialized patch of modified heart muscle fibers known as th

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Myogenic

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(D) The heart of a mammal is called $Myogenic$ because the contraction is initiated by a specialized patch of modified heart muscle fibers known as the $Sinu-auricular$ node or $S.A.$ node.Unlike $Neurogenic$ hearts,where the heartbeat is initiated by nerve impulses from a ganglion,$Myogenic$ hearts generate their own electrical impulses within the cardiac muscle tissue itself.This property allows the heart to continue beating even when removed from the body,provided it has an adequate supply of oxygen and nutrients.Therefore,the correct option is $(d)$.

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

Since it is the sinu-auricular node which initiates the impulses in the heart of a mammal,it is called:

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Match the following columns:

Column-$I$ Column-$II$

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

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

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

Sino-atrial node is called the pacemaker of our heart. Why?

An artificial pacemaker is implanted subcutaneously and connected to the heart in patients:

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