Heart beat is accelerated by

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(D) The heart rate is regulated by the autonomic nervous system and endocrine hormones.$1$. The sympathetic nervous system increases the heart rate by

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Sympathetic nerves and nor epinephrine

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(D) The heart rate is regulated by the autonomic nervous system and endocrine hormones.$1$. The sympathetic nervous system increases the heart rate by releasing neurotransmitters that stimulate the sinoatrial node.$2$. Adrenaline (epinephrine) and noradrenaline (norepinephrine),secreted by the adrenal medulla,also increase the heart rate and cardiac output during stress or 'fight-or-flight' responses.$3$. Conversely,the parasympathetic nervous system and acetylcholine decrease the heart rate.Therefore,sympathetic nerves and nor epinephrine are responsible for accelerating the heart beat.

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