Physiology - Cardiac Output= volume of blood pumped/min by...

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Cardiac Output = volume of blood pumped/min by each ventricle SV= blood pumped/ beat by each ventricle HR= # beats/ min CO= HR x HR -total cardiac output is about 5L/min How controlled? -alter either heart rate or stoke volume Regulation of the heart -SA node will drive the heart at a rate of its spontaneous activity -this rate is acceptable at rest, but along would not allow you to increase cardiac output with exercise -sympathetic and parasympathetic influence HR (chronotropic effect ) -norephinephrine and epinephrine stimulate opening of pacemaker HCN channels (sympathetic) -ACh promotes opening of K channels and causes them to depolarize slower (parasympathetic) Where does it happen? -Cardiac control center: in medulla and coordinates activity of autonomic innervation -sympathetic endings in atra and ventricles can also stimulate increased strength of contraction 1. ANS (heart rate) -controls SA (initiate the beat) and AV (actual beat) nodes 2. Stroke Volume 1. EDV: volume of blood in ventricles at end of diastole (passively filling-heart in diastole
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This note was uploaded on 04/07/2011 for the course PHYS 100 taught by Professor Balassare during the Fall '10 term at Saint Louis.

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Physiology - Cardiac Output= volume of blood pumped/min by...

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