BIO 211 Lecture Notes - Lecture 7: Perfusion, Cardiac Arrhythmia, Inotrope
1 Dec 2020
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Document Summary
Carry parasympathetic fibers to small ganglia in cardiac plexus. Cardiac enters of medulla oblongata: cardioacceleratory center controls sympathetic neurons (increase hr, cardioinhibitory center controls parasympathetic neurons (slows hr) Respond to hypercapnia (increased co2) and acidosis by stimulating the cardiac center to increase hr and improving perfusion of tissues. Decreased hr, e. g. beta-blockers, ca2+ channel blockers. Increased hr (by sympathetic stimulation of sa node). Increases hr in response to increases venous return. Serves to decrease pressure in the superior and inferior vena cavae by drawing more blood out of the right atrium. Decreased atrial pressure, more blood from vena cavae, resulting in decrease in the venous pressure of the great veins. Preload (how much blood returns to heart): ventricular stretching during diastole i. e. contractility (force of contraction): force produced during contraction, at a given. Afterload (resistance against which heart has to pump): tension the ventricle produces to.
