HLSC 1201U Chapter Notes -Pericardial Fluid, Aorta, Heart Valve
Document Summary
Fibrous pericardium tough, loose-fitting inextensible sac, outer layer. Serous pericardium parietal layer lies inside the fibrous pericardium and visceral. Covering of the heart functions to protect against friction layer (epicardium) adheres to the outside of the heart. Myocardium delicate, inner layer of endothelial tissue. Pericardial space contains 10 15 ml of pericardial fluid. Epicardium considered the outer layer of the heart wall/inner heart and heart layer. The heart has 4 chambers 2 atria and 2 ventricles. 2 atria: superior chambers receive blood from veins and pump it into ventricles. 2 ventricles: inferior chambers receive blood from atria, pump it into arteries. Medium myocardium medium pressure (medium distance) Sl valves prevent backflow into the ventricles; pulmonary valve and aortic valve. Atrioventricular (av) valves prevent backflow into the atria; tricuspid valve and mitral valve. Coronary arteries first branch off the aorta; each ventricle receives blood only from a small branch of a coronary artery, few anastomoses.
