MEDICAL PHYSIOLOGY

PHYSIOLOGY

CARDIOVASCULAR PHYSIOLOGY

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
The pace maker of the Heart is
A
Sinoatrial Node (SAN)
B
Atrioventricular Node (AVN)
C
Purkinje Fibers
D
Semilunar Valves
Explanation: 

Detailed explanation-1: -The sinus node continuously generates electrical impulses, thereby setting the normal rhythm and rate in a healthy heart. Hence, the SA node is referred to as the natural pacemaker of the heart.

Detailed explanation-2: -The delay in conduction of impulse in this node changes the duration of contraction between the atria and the ventricles. Hence AV node is called as the pace-setter.

Detailed explanation-3: -Sino-atrial node is also called of the heart. Q. Assertion :Sino-atrial node (SAN) is called the pacemaker. Reason: SAN generates the maximum number of action potentials and is responsible for initiating and maintaining the rhythmic contractions of the heart.

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