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Why would blood pressure and heart rate increase under some circumstances but not others?

Why would blood pressure and heart rate increase under some circumstances but not others?

Science   Anatomy-And-Physiology   
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Answer #1

When we require instant energy and oxygen, this is fulfilled by the blood and blood is pumped by the heart. os heart has to pump forcefully which increases blood pressure and it has to pump fast that increases the heart rate.


These conditional reactions of the body are known as the "fight-or-flight" response. We need to react quickly to life-threatening situations. Or if we have to win a race or any kind of competition where more energy is required. With the help of hormones such as adrenaline (RAASystem) works to fulfil those requirements. This situation makes blood pressure and heart rate increase.

When we are in resting or not doing anything, or we are calm or sleeping. The blood pressure and heart rate is normal or even lower than the normal.

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