PSL301H1 Lecture 10: L10 Regulation of Cardiac Output
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PSL301H1 Full Course Notes
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Stroke volume: amount of blood pumped by one ventricle in one contraction: sv = edv esv. Cardiac output: amount of blood pumped per ventricle per unit time: co = hr x sv, ~5l/min (~70bpm x 70ml/beat = 4. 9l/min, normal blood volume is ~5l. Cardiac reserve: difference between resting and maximal co. What affects stroke volumes: we have a heart to move blood through the circulatory system. The difference between esv and edv is on average 70ml = stroke volume. Cardiac output (ability of heart to pump blood) is the heart rate (number of bpm) x stroke volume (volume pumped per beat) Produce of hr and sv is a flow rate (co) Cardiac output represents the amount of blood pumped per ventricle per unit time: usually approx. Cardiac reserve is the potential your body has to elevate cardiac output in response to exercise or any sympathetic activation. Preload is ability to deliver blood to the heart, equates to venous pressures.
