BIOL 1119 Study Guide - Final Guide: Bone Marrow, Defensin, Osmotic Concentration
29 Dec 2016
School
Department
Course
Professor
Document Summary
Pericardium: double layer sac that wraps around the heart: reduced friction, protects it from excessive expansion. Myocardium: fibrous skeleton is an electrical stimulator, thickest part of heart wall (most thick in left ventricle, co is the same in both ventricles. Pressure differences are what cause valves to open and close. Papillary muscles help prevent the av valves from inverting. Tunica interna has endothelium normally repels platelets and only when they are damaged can platelets stick on and contributes to vasodilation and vasoconstriction. Arterioles can dramatically reduce or increase blood flow to certain areas. Precapillary sphincters are only influenced by local factors. Chemoreceptors pick up on changes in ph (more important), co2 (next important), and o2: affect breathing rate first and heart rate second. A shunt can bypass blood flow to part of the body away from the skin during cold exposure. In the pulmonary circuit, bp is low net reabsorption. In the capillary glomerulus, bp is high net filtration.
