ENS 304 Lecture Notes - Lecture 3: Systolic Geometry, Stroke Volume, Mean Arterial Pressure
24 Jul 2020
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Document Summary
Exercise elicits higher energy demands relative to the intensity of work meeting oxygen demands. Passive filling: 80% of ventricular filling; open av valves. Active filling: last 20% of ventricular filling due to atrial contraction. Isovolumetric contraction: av valves close due to ventricular contractions. Ejection phase: ventricular contraction goes until sl valves open. Ventricular relaxation: pressure decreases and sl valves close. Diastole: phases 1,2, and 5 - when ventricles are relaxed. Systole: phases 3 and 4 - when the ventricles contract. Cardiac output (q): amount of blood pumped through the circulatory system in one minute (l/min) Stroke volume (sv): amount of blood pumped out of the heart per beat when the ventricles contract. Heart rate: expressed as beats per minute. Total peripheral resistance (tpr): sum of resistance to blood flow by all blood vessels. Blood pressure (bp): pressure inside vessels, expressed as mmhg. Mean arterial pressure (map): dbp + (sbp - dbp) Dbp: ventricles fully relaxed while filled, ~80.
