Medical Sciences 3999A/B/Y Lecture Notes - Lecture 27: Tunica Intima, Internal Carotid Artery, Vasa Vasorum
2 Mar 2020
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Document Summary
Two distinct systems that complement each other and operate in parallel: Blood circulatory (cardiovascular) system: composed of heart and vessels that distribute blood and return it back to heart. Lymph vascular system: composed of independent channels that collect excess tissue fluid from body tissues and return it to blood circulation. Composed of heart, efferent vessels (arteries), capillary networks, and veins. Macrovascular: vessels >0. 1 mm in diameter (i. e. large arterioles, muscular and elastic arteries, and muscular veins) Microvascular: vessels <0. 1 mm in diameter (i. e. arterioles, capillaries and postcapillary venules) Vascular wall composed of three basic structural constituents: Amount and arrangement in circulatory system influenced by: 1) mechanical factors (i. e. blood pressure), 2) metabolic factors (i. e. factors (i. e. blood pressure), 2) metabolic factors (i. e. local tissue requirements) Terminal branches of arterial tree that supply capillary bed. Internal elastic lamina: thin and fenestrated; absent from terminal arterioles. Arteries: function to distribute blood from heart to capillaries.
