NUR 21801 Lecture Notes - Lecture 13: Sinoatrial Node, Shortness Of Breath, Suprasternal Notch
Document Summary
Precordium front of the chest heart structures. Endocardium: thin layer endothelial tissue, lines inner surface of heart chambers and valves. 2 av valves (between atria and ventricles), 2 sl valves (pulmonary and aortic valves) Open during diastole (relaxation/filling) to allow ventricles to fill with blood. During systole (pumping) close to prevent regurgitation of blood into atria. Select the best description of the tricuspid valve: left slv, right av, left av, right slv. Right atrium tricuspid valve right ventricle pulmonary artery lungs left atrium bicuspid (mitral) valve left ventricle aortic valve body right atrium. Diastole: ventricles relaxed, all valves open, pressure in atria > ventricles, toward end atria contract, push last blood into ventricles: pre/atrial systole. Heart can alter its co to adapt to metabolic needs of body. Preload a(cid:374)d afterload affe(cid:272)t heart"s a(cid:271)ilit(cid:455) to increase co. Resistance against which ventricle must ump its blood. Overcome difference ventricular muscle tenses, isovolumic contraction. After aortic valve opens rapid ejection.
