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A&P Ch 20 Pt 2

A&P Ch 20 Pt 2 ; Veins and Pathways of Blood Vessels

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



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