PHGY 214 Lecture Notes - Lecture 23: Mecha, Endocardium, Vasospasm
8 Dec 2017
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Muscular organ, size of fist, ventrally centered in thoracic cavity left ventricle extends more to l. Sandwiched b/n lungs, lies on diaphragm (for respiration, sep thorax and abd cavity) Perichardium: fluid filled sac, visceral (attached to heart) and parietal layer (external layer), fluid prevents friction b/n chest and walls. Adipose tissue to maintain body heat, cushions, contains coronary arteries: build up of adipose= coronary artery disease, pericharditis: infection, inflammation and develops friction. R atrium first chamber for deoxy blood. Tricuspid valve lets blood into r atrium, contraction pumps it into pulmonary artery. Oxy blood into pulmonary veins l atrium bicuspid valve left ventricle contracts bicuspid closes and blood goes to aorta thru left semi-lunar valve. Pulmonary valve/r semilunar: deoxy enters here, 3 cusps. Aortic/ l semilunar: 3cusps tricuspid/ r av: has three leaflets/cusps collagenous tissue= chordae tendineae prevent inversion of valves. Papillary muscles: keeps valves taught when ventricles contract, put tension on chordae tendineae semilunar shape prevents backflow of blood.
