PNB 2265 Lecture Notes - Lecture 7: Coronary Artery Disease, Allergen, Prehypertension
16 Aug 2018
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Without blood tissues die: brain within seconds, muscle within minutes. Brain and heart win over everyone: they keep all the other organs alive. Muscles when they need it (activity) You are listening to 1000s of voices demanding your attention and a limited amount of blood: because blood volume in the arteries determines pressure, and there is an upper limit to the pressure it can tolerate. Medulla cv control center (cvcc) autonomic system reflex regulation of heart, blood vessels. Ration between sympathetic and parasympathetic systems tone. The medulla in the brain stem makes the decision of who gets what and when. Extrinsic (from the outside: cns, hormonal. If the(cid:455) have lots of o(cid:454)(cid:455)ge(cid:374) the(cid:374) the(cid:455) do(cid:374)(cid:859)t (cid:374)eed (cid:271)lood, (cid:271)ut if the(cid:455) are produ(cid:272)i(cid:374)g. Co2 then they need blood because that will replenish oxygen. Ensures only tissues that need oxygenated blood receive it. Capillaries open and close like blinking lights.
