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
Answer: (D) E-C-A-D-B. Answer: (d) E-C-A-D-B Solution: The action potential originates in the SA node (E), travels to the AV node (C), then to the AV bundle (A), which divides into the right and left bundle branches (D), and finally spreads through the ventricular musculature via the Purkinje fibres (B).
- A.A-E-C-B-D
- B.B-D-E-C-A
- C.E-A-D-B-C
- D.E-C-A-D-B✓
Correct Answer
(D) E-C-A-D-B
Solution & Explanation
Answer: (d) E-C-A-D-B Solution: The action potential originates in the SA node (E), travels to the AV node (C), then to the AV bundle (A), which divides into the right and left bundle branches (D), and finally spreads through the ventricular musculature via the Purkinje fibres (B). Thus the correct conduction sequence is E-C-A-D-B. NCERT: Ch 15, p.199, line 14 — "atrio-ventricular bundle (AV bundle) continues from the AVN... divides into a right and left bundle"