NPB 10 Lecture Notes - Lecture 10: Mean Arterial Pressure, Artificial Cardiac Pacemaker, Cardiac Output
23 Jan 2018
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Document Summary
Arteries and arterioles take blood away from heart: elastic arteries big; receive blood from ventricles, arterioles resistance vessels, vasco constriction diameter gets smaller. Veins and venules (smaller) drain the capillaries: capacitance blood vessels stores blood temporarily. Capillaries exchange blood vessels: endothelial cells are very flat and thin. Sometimes gases like co2 or o2 can go right through the wall into the blood; roll and connect to other endothelial cells. Where they connect, some have pores where blood can leak: pore, fenestra: can be big; sometimes capillaries with none fenestrations. Sympathetic nervous system (sns) and parasympathetic nervous system (pns) control heart function. Increase of n to the heart : pacemaker cells fire faster heart rate increases, ventricular muscle contract stronger stroke volume increases. Increase of pns to the heart pacemaker cells fire slower heart rate decreases: sns and pns control all visceral organs, sns and pns make up the autonomic nervous system, sns is activated/associated with:
