A&P Ch 20 Pt 2 ; Veins and Pathways of Blood Vessels
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| What are venules? | The smalls veins that are companion vessels with arterioles
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| What do venules form? | Merge to form veins
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| What does the largest venule have? | All 3 tunics
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| What are the smallest venules? | Postcapillary venules
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| What do systemic veins act as? | Blood reservoirs
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| What percentage of blood is in systemic circulation? | 70%
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| What are the 2 categories of systemic circulation? | Systemic veins, systemic arteries, and systemic capillaries
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| What percentage of blood is in systemic veins? | 55%
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| What percentage of blood is in systemic arteries? | 10%
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| What percentage of blood is in systemic capillaries? | 5%
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| What percentage of blood is in pulmonary circulation? | 18%
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| What percentage of blood is in the heart? | 12%
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| How can blood be moved from veins into circulation? | Vasoconstriction of veins. Ex : When more blood needed during exertion
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| How can blood be shifted back into reservoirs? | Vasodilation of veins. Ex: When less blood needed during rest
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| What is a simple pathway of blood vessels? | One major artery delivers blood to organ or region
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| What is an end artery? | One that provides only one path for bloods to reach an organ or region?
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| What do end arteries branch into? | Smaller arteries that become arterioles
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| What do each arteriole feed into? | A capillary bed
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| What drains the capillary bed? | Venule
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| How is a major vein formed? | Venules merge
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| What is another name for arterial anastomosis? | Arterial joining
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| What is arterial anastomosis? | Two or more arteries converge to supply the same region. E.G., superior and inferior epigastric arteries supplying abdominal wall
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| What does arteriovenous anastomosis (shunt) do? | Transports blood from artery directly to vein. E.G., in fingers, toes, palms, ears.
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| If the body is hypothermic, what does arteriovenous anastomosis (shunt) do? | Allow areas to be bypassed
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| Among the alternative pathways of blood vessels, which one is more common? | Venous anastomosis
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| What is venous anastomosis? | Two or more veins drain same body region. E.G., basilic, brachial, and cephalic veins draining the upper limb
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| What is a portal system? | Two capillary beds in sequence
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| What is the pathway of the portal system? | artery to capillary bed to portal vein to capillary bed to vein; E.g., hypothalamo-hypohyseal portal system
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