PHYSL402 Lecture Notes - Lecture 16: Vascular Resistance, Central Venous Catheter, Thoracic Cavity
7 Nov 2016
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Factors that influence central venous p and venous return venous tone increase innervation produces in central. Lt reg of bp is through regulation of bv. Control of bp by low-p baroreceptors (volume receptors) in atria of heart. Thus, map = (hr x sv) x tpr: effects of cardiac output on mean arterial p. Note: in above formula, map is dependent on co. Elastic recoil maintains steady flow of blood to rest of circulation. Assume that peripheral resistance does not change: effect of total peripheral resistance on mean arterial p. Doi(cid:374)g the (cid:862)opposite exer(cid:272)ise(cid:863): if (cid:373)ai(cid:374)tai(cid:374) flow (cid:272)o(cid:374)sta(cid:374)t (cid:271)ut increa e total resista(cid:374)(cid:272)e (constriction) increased map (occurs moment to moment) but reflexes to maintain map. St and lt regulation of map: occurs via different mechs. Involves kidneys, not so much heart and blood vessels. Integration center = cardiovascular centers in the brainstem. With increased p increased ap freq and info delivery to cv centers in brain.
