PHGY 210 Lecture Notes - Lecture 20: Heart, Mean Arterial Pressure, Papillary Muscle

• School: McGill University
• Department: Physiology
• Course: PHGY 210
• Professor: Ann Wechsler

Document Summary

Spiral-movement reentry: in contrast to circus-movement reentry, no anatomical obsticle needed to generate spiral-wave reentry. See picture in slides activation wave front= top curve in picture. Difibrillating heart: looks like a bag of worms , activation is no longer synchronized and no blood gets pumped. Ignore pulmonary vein ablation for treatment of atrial fibrillation slide. Receptor (rianodine receptor) is also a ca2+ channel. Can be atrial or ventricular systole, but when you see systole by itself, it almost certainly means ventricular systole. Isovolumetric ventricular contraction: av valves closed, aortic and pulmonary valves closed, atria relaxed, ventricles contract. Ventricular ejection (blood flows out of ventricle: av valved closed, aortic and pulmonary valves open, atria relaxed, ventricles contract. Isevolumetric ventricular relaxation: av valves closed, aortic and pulmonary vavles closed, atria relaxed, ventricles relaxed. Ventricular filling (blood flows into ventricles) happens for a long time: av valves open, aortic and pulmonary valves closed, atria relaxed and ventricles relaxed.