BIO271H1 Lecture Notes - Lecture 10: Basophil, Cardiac Muscle, Coagulation

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7 Apr 2014
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Lecture 10: circulatory systems regulation of blood pressure and flow; Not an action potential signal measured is a composite of all electrical activity taking place in the heart. Sa nodes aren"t working (triggers atrial depolarization) Sa nodes initiate atrial depolarization. No communication of myocytes in atrium = no p waves: qrs complex, ventricular depolarization + atrial repolarization, t wave, ventricular repolarization. Used for clinical diagnosis of problems with conducting system. Av valves are opened, semilunar valves are closed. Increase in volume in the atria. Pressure in atria is higher than the ventricles = why av valves are opened: when we initiate atrial systole. Pressure increases in atrium. Ventricular contraction (isovolumetric contraction) can trigger increase in pressure in ventricles = closing of. Av valves, semilunar valves still closed (brief period) All valves remain closed until pressure in ventricles are higher than the pressure in the aorta. Semilunar valves then open (only in left side), blood is ejected into aorta.

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