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A&P Ch 20 Pt 2
A&P Ch 20 Pt 2 ; Veins and Pathways of Blood Vessels
| Question | Answer |
|---|---|
| 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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