Q. The hormone that stimulates heart beat is:
✅ Correct Answer: (D)
Thyroxine
Explanation:
Thyroxine (T₄) is a hormone produced by the thyroid gland that plays a crucial role in metabolism, heart rate, and energy regulation.
- It increases cardiac output, heart rate, and blood pressure by enhancing the sensitivity of the heart to adrenaline (epinephrine).
Why are the other options incorrect?
- Dopamine (A) → A neurotransmitter that affects mood and movement but does not directly stimulate the heart.
- Gastrin (B) → A digestive hormone that stimulates acid secretion in the stomach.
- Glycogen (C) → A stored form of glucose, not a hormone.
Thus, the correct answer is (D) Thyroxine.
Explanation by: Mr. Dubey
Thyroxine (T₄) is a hormone produced by the thyroid gland that plays a crucial role in metabolism, heart rate, and energy regulation.
- It increases cardiac output, heart rate, and blood pressure by enhancing the sensitivity of the heart to adrenaline (epinephrine).
Why are the other options incorrect?
- Dopamine (A) → A neurotransmitter that affects mood and movement but does not directly stimulate the heart.
- Gastrin (B) → A digestive hormone that stimulates acid secretion in the stomach.
- Glycogen (C) → A stored form of glucose, not a hormone.
Thus, the correct answer is (D) Thyroxine.