Zoology-Heart & Circulation
NEET Zoology Heart & Circulation Assertion Reason Question
Type: Assertion Reason-assertion-Hard-Class 11
Assertion (A): The sinoatrial node (SAN) is responsible for maintaining the heart's rhythmic contractile activity. | Reason (R): The SAN generates action potentials that stimulate the atria to undergo simultaneous contraction.
A
Both A and R are true and R is the correct explanation of A.
B
Both A and R are true but R is not the correct explanation of A.
C
A is true but R is false.
D
A is false.
Correct Answer
Option A
Detailed Explanation
The SAN is termed the pacemaker because it initiates and maintains the rhythmic contractile activity by generating action potentials, which cause the atria to contract.
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