Zoology · Body Fluids and Circulation

NEET (UG) 2024 — Question 149

Following are the stages of pathway for conduction of an action potential through the heart

A. AV bundle

B. Purkinje fibres

C. AV node

D. Bundle branches

E. SA node

Choose the correct sequence of pathway from the options given below

Option A:
E-C-A-D-B
Correct
Option B:
A-E-C-B-D
Option C:
B-D-E-C-A
Option D:
E-A-D-B-C

Answer: A

Step-by-step solution

Conduction of the cardiac impulse begins at the SA node (E). The impulse then reaches the AV node (C). It next passes through the AV bundle (A). It travels down the bundle branches (D). Finally it spreads through the Purkinje fibres (B). Thus the correct sequence is $E \rightarrow C \rightarrow A \rightarrow D \rightarrow B$ , which is option A.

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Exam: NEET (UG) 2024
Paper: 2024 paper
Subject: Zoology
Chapter: Body Fluids and Circulation
Topic: Cardiac Cycle

Answer: A

Step-by-step solution

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