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| Q. |
The hormone that stimulates heart beat is – |
| A. | Thyroxine |
| B. | Gastrin |
| C. | Glycogen |
| D. | Dopamine |
| Answer» A. Thyroxine | |
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Explanation: Thyroxine is the main hormone secreted into the bloodstream by the thyroid gland. It plays vital roles in digestion, heart and muscle function, brain development and maintenance of bones. It increases heart rate, cardiac contractility and cardiac output and alsopromotes vasodilation, which leads to enhanced blood flow to many organs. |
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