Neural centre in the medulla oblongata can moderate the cardiac function through:

What is the effect of the parasympathetic nervous system on the heart rate?

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

What is the effect on the heart rate if the parasympathetic nerve is cut in a rabbit?

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:

Heart beats are accelerated by