Windkessel Vessel --- Aorta and big arteries Contain a large amount of elastic tissue besides the smooth muscle Transiently store blood during systole, and then shrink to produce onward blood flow during diastole 120 60 LVP aft Atrium Ventricle Diastole TIME (s) Function of the windkessel vessel
Windkessel Vessel --- Aorta and big arteries. ➢ Contain a large amount of elastic tissue besides the smooth muscle. ➢ Transiently store blood during systole, and then shrink to produce onward blood flow during diastole
Windkessel effect Convert the sharp pressure fluctuations in ie ventricle(0 to 120 mmHg) into much smale pressure fluctuations in the arteries(80 to 120 mmhG, Convert the intermittent ventricular ejection into continuous blood blood in the vessels 120 Ventricle LVP Function of the windkessel vessel A TIME(s)
➢ Windkessel effect. ➢ Convert the sharp pressure fluctuations in the left ventricle (0 to 120 mmHg) into much smaller pressure fluctuations in the arteries (80 to 120 mmHg). ➢ Convert the intermittent ventricular ejection into continuous blood blood in the vessels
2. Distribution Vessel-middle arter Rich in smooth muscle, systole or diastole under some physical and chemical factors Together with resistance vessels. match the blood flow to different organs with their requirements
2. Distribution Vessel – Middle arteries ➢ Rich in smooth muscle, systole or diastole under some physical and chemical factors. ➢ Together with resistance vessels, match the blood flow to different organs with their requirements
Distribution of Cardiac Out 25L Cardiac output min 25 L/min 100% 3-5% 4-5%2-4%0.5-1%3-4% 80-85% -20 L/min utricle Heavy work Rest Rest Left ventricle 0.75L/ 100% 20-25%4-5% o°o 15-20% Cardiac output 5 L/
Distribution of Cardiac Output
3. Precapillary Resistance Vessels Small arteries and aster Less elastic than the larger Arteries arteries Have a thicker layer of Metarterioles act as a Precapillary bypass channel and sphincters regulate flow into smooth muscle Arteriole capillary beds Venule smooth Capillaries Provide the greatest resistance to blood flow through the arterial system Sm venule since they have narrow lumina Arteriovenous bypass Precapillary sphincters
3. Precapillary Resistance Vessels – Small arteries and arterioles ➢ Less elastic than the larger arteries ➢ Have a thicker layer of smooth muscle. ➢ Provide the greatest resistance to blood flow through the arterial system ➢ since they have narrow lumina