He functionalanatomyofthe functionalanatomyofthe

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Unformatted text preview: forms the wall of the atria and ventricles Endocardium Thin, three­layered membrane lining the heart The pe the he Functional Anatomy of the Functional Anatomy of the Heart Atria x2 Ventricles x2 Components and Function of the Components and Function of the Vascular System – The Pipes Components Arteries and arterioles Capillaries Venules and veins Function Delivery of oxygen and nutrients and removal of wastes from the tissues Functions of the Vascular System Functions of the Vascular System Arteries and arterioles function as a distribution system to move blood to the tissues Capillaries serve as an exchange system where transfer of gases, nutrients, and wastes takes place Venules and veins serve as collection and storage vessels that return blood to the heart Composition of the Arterial System Composition of the Arterial System Arteries Thick­walled vessels with large amounts of elastic fibers Stretch during cardiac systole and recoil during diastole Arterioles Serve as resistance vessels for the circulatory system Act as control valves through which blood is released as it moves into the capillaries Composition of Blood Vessels Composition of Blood Vessels Tunica externa, or tunica adventitia, (outermost covering) Tunica media, (middle layer) Composed of fibrous and connective tissues that support the vessel Largely a smooth muscle layer that constricts to regulate and control the diameter of the vessel Tunica intima, (inner layer) An elastic layer that joins the media and a thin layer of endothelial cells that lie adjacent to the blood Hemodynamics Hemodynamics Hemo: means “blood” Dynamic: refers to the relation between motion an...
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