Body Fluids and Circulation Question 74

74. Impulse of heart beat originates from [2002]

(a) S. A. node

(b) A. V. node

(c) Vagus nerve

(d) Cardiac nerve

Show Answer

Answer : a

Hints & Solutions

(a) SAnode is called the pacemaker because it initiates the cardiac impulse. AV node receives the impulse from the SA node and transmits it to the ventricles.