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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Heart is innervated by

What happens to the heart rate if the parasympathetic nerve of a rabbit is cut?

Cardiac activities of the heart are regulated by:
$A.$ Nodal tissue
$B.$ $A$ special neural centre in the medulla oblongata
$C.$ Adrenal medullary hormones
$D.$ Adrenal cortical hormones
Choose the correct answer from the options given below:

Assertion $(A) :-$ Parasympathetic neural signals decrease the cardiac output.
Reason $(R) :-$ Parasympathetic neural signals decrease the rate of heartbeat and the speed of conduction of action potentials.

When the normal heart of a man is injected with a physiological concentration of adrenaline, it shows:

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