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18 Cards in this Set
- Front
- Back
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What is the equation for Mean Arterial Pressure?
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MAP = Diastolic Pressure + 1/3( Systolic Pressure - Diastolic Pressure)
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Most blood vessels receive sympathetic stimulation on ______ receptors which cause ____________
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alpha-1, vasoconstriction
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coronary, cerebral, liver, and skeletal muscle mainly receive ______ sympathetic stimulation, causing __________
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beta-1, vasodilation
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Blood vessels to salivary, GI and erectile tissue are the only ones to receive ____________ stimulation
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parasympathetic
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What are the reflex influences on arterioles and veins? local influences?
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reflex: sympathetic constrictors; local arterioles: basal tone, vasodilator metabolites; local veins: passive distention, external compression
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___% of blood volume is in systemic circulation, most of which is in _______
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80, veins
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What constitutes the central blood volume?
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central vena cava, intrathoracic portions of the inferior vena cava, right atrium and right ventricle, pulmonary circulation, left atrium
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What are the three things that affect the vascular function curve?
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Blood volume, capacitance and total peripheral resistance
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Increasing arteriolar resistance _________ venous return
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decreases
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What happens to Pmc when arteriolar resistance changes?
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nothing (arteriolar resistance does not affect blood volume)
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How does the circulatory system restore CO after hemorrhage?
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What are the high pressure receptors?
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Carotid Sinus, Aortic Arch
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Where are the low pressure receptors?
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Atria, Ventricles, Pulmonary Arteries
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Stretch of ________ ________ receptors works to dump fluid
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low pressure
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Stretch of ___________ __________ receptors works to decrease BP
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high pressure
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What hormone is released by the myocytes in response to stretch?
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ANP (atrial natruretic peptide)
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decreased blood volume and circulating Angiotensin would cause a release of ________ from the ___________
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ADH, pituitary gland
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What is the cause of vasovagal syncope?
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medullary center decrease of SNS and increase of PNS
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