Multiple choice

The hormone having a stimulatory effect on the heart is _____.

  1. adrenaline

  2. gastrin

  3. glucagons

  4. thyroxine
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A Correct answer
Explanation

Adrenaline (epinephrine) binds to beta-1 adrenergic receptors in the heart, increasing heart rate, force of contraction, and cardiac output. This is part of the sympathetic 'fight or flight' response. Gastrin stimulates gastric acid secretion, glucagon raises blood glucose, and thyroxine regulates basal metabolism but does not directly stimulate cardiac function like adrenaline does.

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