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45 Cards in this Set
- Front
- Back
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What is the normal TPR
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1 PRU
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What is the TPR at extreme vasodilation
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0.2 PRU
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What is the TPR at exteme vasoconstriction
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4 PRU
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What will happen to PVR PRU during exercise
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it will decrease
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What will happen to PVR PRU during COPD
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it will increase
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What are the benefits of having a tonically vasomotor tone
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If max dilated
would require massive CO would only be able to decrease blood flow |
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On the arterial side of the circulation where does the resistance become high
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arterioles
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Normal CVP
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0-8 torr
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Where does turbulent blood flow occur
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large vessels
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What are the units for PRU
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mmHg/mL/sec
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In what areas can nervous control not override autoregulation
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brain, lungs, heart, skeletal muscle
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Last part of the microcirculation with SNS innervation
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aterioles
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Parts of the microcirculation without SNS innervation
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metarterioles
precapillary sphincters capillaries |
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what are three determinants of autoregulation
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tissue metabolism
oxygen availability changes in arterial pressure |
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an increase in blood flow in response to an increase in metabolic activity
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active hyperemia
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an increase in blood flow following an temporary interruption of blood flow to the tissue
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reactive hyperemia
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Regulates cerebral autoregulation on a moment to moment basis
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CO2
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Most important determinant of blood flow to the active skeletal muscle
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oxygen demand
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Stimulus for the changes in vascularity as it relates to long term control of blood flow
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O2 availability
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When does nervous regulation occur
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when it's in the body's best interest
when large volumes of BF need to be controlled |
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How does the vasodilator area promote blood flow
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sends inhibitory nerve impulses to the vasoconstrictor area
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Where is the sensory area located
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Nucleus of the tractus solitarius
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The activity of the vasomotor center has a direct and indirect relationship to which brain centers
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cardioaccelerator
cardioinibitor |
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What is the exception to the direct relationship of the vasomotor center and the cardioaccelerator center
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Bainbridge reflex
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Major higher center that modifies the vasomotor center
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hypothalamus
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Able to reset the vasomotor center to a higher level in times of exercise
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motor cortex
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What are the factors that directly relate to resistance
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viscosity
length of vessel HCT SNS stimulation |
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What are the factors that indirectly relate to resistance
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radius
distensibility blood pressure SNS inhibition |
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Arteriole resistance think
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SVR
Blood flow |
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Venules think
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Preload
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Veins that don't have valves
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IVC
SVC pulmonary veins |
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Regulation according to tissue's needs
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autoregulation
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Regulation according to body's needs
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nervous regulation
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Vessels with smooth muscle but no innervation
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metarterioles and precapillary sphincters
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3 factors governing autoregulation of the brain
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MAP
O2 CO2 |
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How does SNS stimulation to the heart , arterial circulation, and venous circulation affect BF
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Heart and Venous- increases BF
Arterial- decreases BF |
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What is the main way that BF is changed
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changing vascular resistance
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Where are the baroreceptors located and how do they transmit impulses to NTS
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carotid and aortic sinus
CN 9 + 10 |
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How is SVR related to DBP
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directly
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How is SV related to PP
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directly
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How is arterial compliance related to PP
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inversely
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What is the formula for MAP
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CO X SVR
HR X SV X SVR |
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When does aldosterone begin to affect BP
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within hours
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When does renin angiotensin vasoconstriction begin to effect BP
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within minutes
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When would you see the Bezolds-Jarisch Reflex and what would happen
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reperfusion of ischemic heart
hypotension and bradycardia (d/t vagal stim of cardioinhibitor center and inhibition of vasomotor center) |
