<prompt> When a person stands suddenly from lying down posture, there isIncreased tone of capacitance vessels.Increase efferent discharge from IX cranial nerveDecreased heart rateAll of the above  <response>: 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. 