Question
Biology Question on Circulatory Pathways
Impulse of heart beat originates from
A
SA node
B
AV node
C
vagus nerve
D
cardiac nerve
Answer
SA node
Explanation
Solution
SA node (Sino Artial node) is a group of specialized cardiac muscle cells which have the property of generating rhythmic excitatory waves. It is also called pacemaker of the heart as it generates the wave for all the chambers of heart to contract.