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Unformatted text preview: lowers blood pressure by causing vasodilation and by stimulating the kidneys to excrete more water and Na + (lowering blood pressure by reducing blood volume). Nitric oxide (NO), secreted by endothelial cells, causes vasodilation. Nicotine in tobacco raises blood pressure by stimulating sympathetic neurons to increase vasoconstriction and by stimulating the adrenal medulla to increase secretion of epinephrine and norepinephrine. Alcohol lowers blood pressure by inhibiting the vasomotor center (causing vasodilation) and by inhibiting the release of ADH (increasing H 2 O output, which decreases blood volume)....
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- Spring '10