Q. Which among the given increases the rate of heart beat -
✅ Correct Answer: (C)
Sympathetic nerves
Explanation:
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
Explanation by: Mr. Dubey
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