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exam 4 ex 21


Blood Vessel Structure Arteries= Elastic, muscular, arterioles Capillaries= Blood flows from arterioles to capillaries Most of exchange between blood and interstitial spaces occurs across the walls Blood flows from capillaries to venous system Veins= Venules, small veins
Structure of Veins Venules and small veins Tubes of endothelium on delicate basement membrane Medium and large veins Valves Allow blood to flow->heart but not in opposite dir, Atriovenous anastomoses Allow blood to flow from art. to small veins w/o passin thru capill.
Pulmonary Circulation Moves blood to and from the lungs Pulmonary trunk Arises from right ventricle Pulmonary arteries Branches of pulmonary trunk which project to lungs Pulmonary veins Exit each lung and enter left atrium
Systemic Circulation: Veins Return blood from body to right atrium Major veins Coronary sinus (heart) Superior vena cava (head, neck, thorax, upper limbs) Inferior vena cava (abdomen, pelvis, lower limbs) Types of veins Superficial, deep, sinuses
Blood Pressure Measure of force exerted by blood against the wall Blood moves through vessels because of blood pressure Measured by listening for Korotkoff sounds produced by turbulent flow in arteries as pressure released from blood pressure cuff
Created by: zeenat



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