Heart beats are accelerated by

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(D) The heart rate is regulated by the autonomic nervous system. $1$. The sympathetic nervous system increases the heart rate and the strength of vent

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Sympathetic nerves and epinephrine

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(D) The heart rate is regulated by the autonomic nervous system. $1$. The sympathetic nervous system increases the heart rate and the strength of ventricular contraction. $2$. The hormone epinephrine (also known as adrenaline),secreted by the adrenal medulla,also increases the heart rate. $3$. Conversely,the parasympathetic nervous system (via the vagus nerve) and the neurotransmitter acetylcholine decrease the heart rate. Therefore,sympathetic nerves and epinephrine are responsible for accelerating heart beats.

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