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this is why you get light headed when you are sitting and stand all of a sudden because when you are sitting your blood tends to pool up in your legs and standing all of a sudden sends a sudden huge burst of a lot of blood to your brain. your brain gets a little oxygen starved when you are sitting. Source(s):
-sudden standing causes pooling of blood in the vessels of the legs and trunk. -transient decrease in venous return and cardiac output results in reduced BP. -baroreceptors in the aortic arch and carotid bodies activate autonomic reflexes that rapidly normalize BP. -^ catecholamine levels ^ vasomotor tone: change heart rate and myocardial contractility. orthostatic hypotension s/s.