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Question:

Why my heart rate, the number of heart beats per minute, increase with no activity?

Anthony

Answer:

Dear Anthony,

Stress (the way that you feel when pressure is placed on you).

Worry (an emotion in which a person feels anxious or concerned about a real or imagined issue).

Unknown and strange situations.

Anxiety (a normal reaction to stress).

An increase in sympathetic nervous system stimulation causes the heart rate to increase.

Stimulation of the sympathetic branch of the autonomic nervous system prepares the body for emergencies: for "fight or flight".

Stimulation via the cardiac beta-1 receptors causes the heart rate to increase.

Actions of the beta-1 receptor include:

-Increase heart rate
-Increase atrial cardiac muscle contractility

Catecholamines stimulate cardiac contractility through beta(1).

Catecholamines are sympathomimetic "fight-or-flight" hormones that are released by the adrenal glands in response to stress.

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