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17 Cards in this Set
- Front
- Back
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what are the main vasodilators in muscle?
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Adenosine, K+, Lactic Acid, CO2
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what effect does NE have in muscle? which receptors does it bind to?
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vasoconstrictor....by alpha receptors
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what is the effect of epinephrine in muscle? which receptors does it bind to?
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vasodilator....beta receptors
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where are B receptors most prominent?
...what do they cause? |
muscle and liver....vasodilation
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where are alpha receptors most prominent? what do they cause?
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kidney and gut....vasoconstriction
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what is vasoconstricted during exercise?
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gut and kidney
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where is bloodflow barely affected by working muscle?
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brain and coronary circulation
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what wins in a working muscle??? sympathetics or vasodilation?
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vasodilation
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what happens to parasympathetics during exercise?
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DECREASED
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what happens to the veins during exercise? *********
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GLOBAL VENOCONSTRICTION (alpha receptors) to increase the Psf and VENOUS RETURN!!!!!!!
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what causes the increased slope (decreased resistance) in the venous return?
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enormous mass of muscles that are vasodilating....(decreased resistance in ARTERIAL part of the circulation!!!!)
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what is the effect of compression of the abdominal muscles?
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Increased Psf
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describe the change in RA pressure during exercise
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minimal!
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what causes increase in Psf?
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sympathetics and compression of abdominal muscles
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what causes the big increase in CO?
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sympathetics (increased contraction and HR)
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why is the sympathetic response very important in the vessels?
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without it, the major vasodilation would cause a huge fall in BP
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what happens to TPR during exercise? why?
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decreases....BP/CO....CO increases much bigger so makes denominator bigger
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