PHED-4547EL Lecture Notes - Lecture 11: Bicuspid Aortic Valve, Pulmonary Valve, Tricuspid Valve
27 Apr 2020
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Document Summary
Function: muscular pump; propels blood through the lungs to the tissues. Heart coverings: pericardium: double-walled sac, outer layer of tough connective tissue, epicardium: visceral layer of pericardium covering myocardium. Layers of heart wall: epicardium: outer layer of connective tissue, coronary arteries, myocardium: middle layer, muscular, thickest layer, workhouse of the heart, endocardium: innermost layer, smooth membrane, heart valves part of endocardium. Cardiac valves permit flow of blood in only one direction. Semilunar valves: cup shaped, surround orifices of aorta and pulmonary artery, free margins of vales face upward, prevent backflow of blood into ventricles during diastole. Pulmonary valve: from rv to pulmonary trunk. Myocardium is too thick for the diffusion of nutrients. Heart is supplied by two coronary arteries that carry arterial blood to heart when relaxes. Aorta branches to right and left coronary arteries that carry arterial blood to the heart when relaxed. Blood passes through capillary beds of myocardium.
