NURS 203 Lecture Notes - Lecture 5: Vascular Resistance, Transcytosis, Circulatory System
Document Summary
All vessels in the body make up the vascular system. Contribute to homeostasis by transporting blood or lymph to deliver oxygen and nutrients and eliminate waste. Heart aorta arteries arterioles capillaries venules veins vena cave heart. Venous return: vascular resistance- friction between blood and vessel walls (depends on lumen size, thickness of blood, length of vessel) The mission of the cardiovascular system is to keep blood flowing through the capillaries in order to continue and maintain gas exchange. Muscular elastic layer- high compliance (stretch and contract with systole and diastole to generate pulse) Arterioles- key to regulating resistance, they determine the amount of blood that can flow into the capillaries (smaller than the arteries) Anastomosed- this means more than one artery can serve a body part or organ. Deliver oxygenated blood: temporal, carotid, brachial, ulnar and radial, femoral, popliteal, posterior tibial, dorsalis pedis.
