Circulatory System - Blood Vessels!

Circulatory System - Blood Vessels! - The Circulatory...

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Unformatted text preview: The Circulatory System: Blood Vessels Assigned reading: pages 756-774 in Saladin 5th ANATOMY OF BLOOD VESSELS Arteries carry blood away from heart high pressure Veins carry blood back to heart low pressure Capillaries connect smallest arteries to veins intermediate pressure Artery: 1 mm 1. Tunica interna 2. Tunica media 3. Tunica externa Vein VESSEL WALL tunica interna endothelium simple squamous epithelium overlying a basement membrane and a sparse layer of loose connective tissue secretes vasodilators & vasoconstrictors produces cell-adhesion molecules ( CAMs ) that induce leukocytes to adhere when inflamed VESSEL WALL tunica media consists of smooth muscle, collagen , and elastic tissue provides strength vasomotion : smooth muscle changes blood vessel diameter and affecting pressure tunica externa loose connective tissue that binds vessel to adjacent structures & anchors nerves, small vessels vasa vasorum : blood supply to large vessels! Structures of Arteris, Veins, and capillaries: overview ARTERIES Arterioles control amount of blood to various organs smooth muscle is THICK minimal tunica externa Muscular (distributing) arteries distributes blood to specific organs smooth muscle is THICK Elastic (conducting) arteries have internal and external elastic lamina recoil during diastole which lessens fluctuations in blood pressure absorb pressure differences ANEURYSM a weak point in an artery or the heart wall forms a bulging sac that may rupture dissecting aneurysm: blood accumulates between the tunics of the artery most common cause is atherosclerosis and hypertension ARTERIAL SENSE ORGANS carotid sinuses: baroreceptors in walls of internal carotid artery BP HR & vasodilation carotid bodies/ aortic bodies: chemoreceptors adjust respiratory rate to stabilize pH, CO2, and O2 adjust heart rate to efficiently deliver blood to lungs CAPILLARIES Capillaries only have the tunica intima: (endothelium & basement membrane) CAPILLARIES...
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Circulatory System - Blood Vessels! - The Circulatory...

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