Choose the correct answer from the alternatives given.
Which one of the following hormones has a stimulatory effect on heart?

Thyroxine

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Gastrin

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Adrenaline

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Thymosin

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Solution

The correct option is C Adrenaline
Adrenaline is rapidly secreted in response to stress and emergency situations and is called emergency hormones or hormones of Fight or Flight. This hormone increases the heartbeat, the strength of heart contraction and rate of respiration.
So the correct answer is adrenaline.

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