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Since resting rates are considerably less than this, it becomes evident that parasympathetic stimulation normally slows HR.

This is similar to an individual driving a car with one foot on the brake pedal.

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Activities that can provoke change include physical exercise, sleep, anxiety, stress, illness, and ingestion of drugs.

Heart rate is the speed of the heartbeat measured by the number of contractions of the heart per minute (bpm).

The heart rate can vary according to the body's physical needs, including the need to absorb oxygen and excrete carbon dioxide.

Sympathetic stimulation causes the release of the neurotransmitter norepinephrine (also known as noradrenaline) at the neuromuscular junction of the cardiac nerves.

This shortens the repolarization period, thus speeding the rate of depolarization and contraction, which results in an increased heartrate.

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