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Q. The hormone that stimulates heart beat is:

  • (A) Dopamine
  • (B) Gastrin
  • (C) Glycogen
  • (D) Thyroxine
  • Correct Answer - Option(D)
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  • Filed under category Biology
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Explanation by: Admin

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?

  1. Dopamine (A) → A neurotransmitter that affects mood and movement but does not directly stimulate the heart.
  2. Gastrin (B) → A digestive hormone that stimulates acid secretion in the stomach.
  3. Glycogen (C) → A stored form of glucose, not a hormone.

Thus, the correct answer is (D) Thyroxine.

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