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18 Cards in this Set
- Front
- Back
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what is the Vasa vasorum |
the supplier of nutrients to the tunica media and externa in larger veins and arteries i |
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how do veins and arteries travel in relation to each other |
they run side by side |
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which of the two (arteries or veins) are thicker-walled with higher BP |
arteries |
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what type of lumen does a collapsed artery have |
small, round lumen |
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what type of lumen does a collapsed vein have |
large and flat |
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which vessel has a lining that contracts |
veins |
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which type of vessel folds |
arteries |
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which vessel has a one way valve |
veins |
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what allows arteries to absorb the pressure waves that comes with each heart beat |
elasticity |
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what is the pulse pressure |
the arteries expanding and contracting with pressure waves |
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when is peak pulse pressure |
systole (contraction) and diastole (relaxation) |
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how can you feel your pulse |
applying pressure to a large or medium sized artery, pressing it against a bone |
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what is contractility of blood vessels controlled by |
strictly the sympathetic division of ANS |
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how does the vasomotor center in the medulla regulate vasoconstriction and BP |
using NE to stimulate alpha-1 receptors on smooth muscle of arteries to decrease lumen size |
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how does the vasomotor center decrease contractility |
decreases NE stimulation. there is not ACh in this, it is only sympathetic stimulation |
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what is vasoconstriction |
the contraction of arterial smooth muscle -REDUCING size of lumen |
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what is vasodilation |
relaxation of arterial smooth muscle INCREASING size of lumen (in response to decrease in NE) |
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what can vasoconstriction and vasodilation affect |
afterload peripheral blood pressure capillary blood flow |
