STANDARDZoology-Human Physiology
STANDARD Zoology Circulatory System MCQ Question
Type: MCQ-conceptual-Medium
Heart beat can be initiated by
A
Sino-atrial node
B
Atrio-ventricular node
C
Sodium ion
D
Purkinje's fibres
Correct Answer
Option A
Detailed Explanation
Heart beat can be initiated by S.A. node (Sino Atrial node) present in the upper left corner of right atrium. It is called as pacemaker of heart because it generates and conducts nerve impulse about 70 - 75 times faster than A.V. node.
Found an issue with this question?