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Which one of the following hormones increases the heartbeat in

June 1, 2025 by rawan239

Which one of the following hormones increases the heartbeat in mammals?

Insulin

Melatonin

Thyroxine

Adrenaline

This question was previously asked in

UPSC NDA-2 – 2022

Download PDF Attempt Online

Adrenaline is the hormone that increases the heartbeat in mammals.

Adrenaline (also known as epinephrine) is a hormone produced by the adrenal medulla. It is released in response to stress and triggers the “fight or flight” response. One of its key effects is to increase heart rate and force of contraction, leading to increased blood pressure and cardiac output.

Insulin lowers blood glucose. Melatonin regulates sleep cycles. Thyroxine increases metabolic rate, which indirectly affects heart rate over time, but adrenaline causes a rapid increase in heart rate in response to acute stimuli.

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