Body Fluids and Circulation · NEET Preparation Zoology
The pacemaker of the human heart is specifically responsible for initiating:
Practice question from Body Fluids and Circulation (NEET Preparation Zoology), with the correct answer and a step-by-step solution.
easy · MCQ · Q-A2377D
The pacemaker of the human heart is specifically responsible for initiating:
- A.Action potentials that determine the heart rateCorrect answer
- B.Closure of the semilunar valves
- C.The second heart sound
- D.Reversal of blood flow into the atria
Solution
The sino-atrial node (SAN) acts as the pacemaker because it can generate action potentials spontaneously, initiating and maintaining the rhythmic contractile activity of the heart.
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