KINE 3012 Lecture Notes - Lecture 6: Vascular Resistance, Cardiac Output, Osmoreceptor
24 Nov 2014
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Document Summary
One monitors systemic circulation other the brain. As they are activated they send signals to the brain. Within the brain there is a cardiovascular control center. Depending on signal received the cv center decreases the sympathetic system or increases the pns. We can regulate heart rate and contractility, tpr to adjust cardiac activity in the short-term. When bp is higher than normal, we increase firing from baroreceptors. We need to decrease output to deal with an increase in bp. If we have an elevated map we need to bring q or tpr down because map = q x. Signal is sent by cardiac centre to decrease sympathetic activity which decreases vasoconstriction, decreasing r, increasing parasympathetic activity. Bp is below normal, decreases firing from baroreceptors, sending signals to cv center in brain. For longer term changes in bp we rely on osmoreceptors in the atria and hypothalamus. In long term regulation we can control plasma volume.
