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Q. Which among the given increases the rate of heart beat -

  • (A) Parasympathetic nerves
  • (B) Cranial nerves
  • (C) Sympathetic nerves
  • (D) Peripheral nerves
  • Correct Answer - Option(C)
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Explanation by: Admin

Sympathetic nerves are part of the autonomic nervous system and are responsible for the "fight or flight" response.

  • They increase the heart rate, strength of contraction, and blood pressure by releasing norepinephrine at the heart.

Why other options are incorrect:

  • (A) Parasympathetic nerves: These slow down the heart rate (via the vagus nerve).
  • (B) Cranial nerves: Some (like the vagus nerve) affect the heart, but they typically reduce the heart rate.
  • (D) Peripheral nerves: A general term; not specifically responsible for regulating heart rate.

Final Answer: (C) Sympathetic nerves

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