Question

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Answer 1

Answer:

Asked: The rate of heartbeat is accelerated by the hormone since, the hormone adrenaline also called epinephrine is known as a stress hormone. In emotional upset (like fear, anger etc.) This hormone is poured into the blood and it accelerates heart beat. The hormone acetylcholine decelerates heartbeat rate.

Explanation:

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Answer 2

Answer:

Hólå,

Explanation:

The sympathetic nervous system (SNS) releases the hormones (catecholamines - epinephrine and norepinephrine) to accelerate the heart rate. The parasympathetic nervous system (PNS) releases the hormone acetylcholine to slow the heart rate.

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