A

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Q. The rate of heartbeat is accelerated by the hormone

  • (A) adrenaline
  • (B) acetylcholine
  • (C) thyroxine
  • (D) pituitrin
  • Correct Answer - Option(A)
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  • Filed under category Biology
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Explanation by: Admin
The hormone adrenaline also called epinephrine is known as a stress hormone. In emotional upsets( like fear, anger etc.) this hormone is poured into the blood and it accelerates heart beat. The hormone acetylcholine decelerates heartbeat rate.

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