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9 Cards in this Set
- Front
- Back
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What causes a change in blood flow by a drug?
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- change in resistance of vasculature.. particularly a change in the lumen size of the arterioles
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What determines CO?
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peripheral circulation! through regulation of venous return**
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venous return is determined by
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TPR and pressure gradient for venous return
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Why does isoproterenol increase CO?
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because it dilates the resistance vessels of the circulation (decreases TPR) which increases venous return
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What are the four extrinsic humoral systems that regulate vascular tone and blood volume?
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RAAS
vasopressin atrail natriuretic peptide ouabain-like factor |
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nitric oxide
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powerful endothelial derived vasodilator
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endothelin
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powerful endothelial derived vasoconstrictor
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effect of methoxamine on blood pressure and heart rate
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causes and increase in blood pressure.. but baroreceptor reflex causes a decrease in heart rate
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What is the difference between isoproterenol and adrenaline i nterms of BP, TPR and CO
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both isoproterenol and adrenaline increase HR and force of contraction
- only isoproterenol increase CO.. because decreases TPR |
