When a person stands suddenly from lying down posture, there is
Increased tone of capacitance vessels.
Increase efferent discharge from IX cranial nerve
Decreased heart rate
All of the above
(A) Increased tone of capacitance vessels. > It occurs due to noradrenergic impulses causing venoconstriction via their action on a1 and a2 - adrenergic receptors on systo veins.
Nervous System