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Pacemaker of heart is...

Pacemaker of heart is

A

AV node

B

bundle of His

C

SA node

D

Purkinje fibres

Text Solution

Verified by Experts

The correct Answer is:
C
(c ) SA node lies in the right wall of right auricle below the opening of superior vena cava. It is also called pacemaker as it is first to originate the cardiac impulses and determines the rate of heatbeat.
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Consider the following four statement (i) - (iv) and select the correct option. (i) SA node is natural pacemaker of heart (ii) Human heart has inter-auricular foramen (iii) Right atrioventricular valve is a semilunar value (iv) Normal systolic and diastolic pressure of human is 120 and 60 mm Hg respectively.

Why is sinuatrial (SA) node also called the pacemaker of heart?

Pacemaker is

Pacemaker of the heart is situated

Assertion: SA node malfunctioning leads to disturbance of Heart rat Reason: SA node is the pacemaker of heart producing electric impulse for heart contraction

Assertion : Though AV node generates impulses, it is still not called as the pacemaker of heart. Reason : The rythmicity of impulse production is not highest in AV node in the neuromuscular conduction pathway.

Which of the following represents the correct events of a cardiac cycle beginning from the firing of an impulse from the pacemaker of the heart ?