205textnotes31 - isovolumic contraction stoke volume (SV):...

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isovolumic contraction stoke volume (SV): SV = EDV - ESV D.5 . The Wiggers diagram: ( Fig. 14-27 ): the relationship between electrocardiogram, heart sounds and pressure volume changes in the left heart and aorta. D.6 . Cardiac output (CO) is a measure of cardiac performance: CO = SV x HR (Heart rate). Factors affecting cardiac output ( Fig. 14-31 ) D.7 Autonomic control : Striated myocardial cells: Fig. 14-12, 14-30 Sympathetic terminals are also located on striated cardiac cells. The activation of the sympathetic system leads to increased ventricular contractility. Under sympathetic stimulation: 1. the contraction of the ventricle is more powerful, 2. contraction and relaxation occur more quickly. D.8 Hormonal control: All the effects of the neurally released norepinephrine on cardiac function are potentially reinforced by circulating epinephrine and norepinephrine from the adrenal medulla. Epinephrine and norepinephrine act on the β -adrenergic receptors of autorhythmic cells and striated myocardial cells.
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This note was uploaded on 12/26/2011 for the course KIN 205 taught by Professor Blaber during the Fall '09 term at Simon Fraser.

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