Ch.21 Blood Vessels
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Created by:
tierrahoward05 on April 3, 2012
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20 terms
Terms | Definitions |
|---|---|
 Tunica Adventitia | outer most layer made of connective tissue |
| Tunica Media | middle layer elastic connecctive smooth muscle tissue |
| Tunica Intima | Inner most layer contains endothylium and some connective tissue |
| Veins | have valves, with large lumen, thin collapsing walls, return blood to heart, 3 tunics with valves. have deoxigenated blood |
| Artery | do not have valves, thick walls that stay open, smaller lumen, start big then branch to get smaller, takes blood away from heart, under high pressure, thick wall is needed, have oxygenated blood |
| Tunics | 3 in the artery |
| Elastic artery | largest, closest to heart, getting blood, contractions take blood to large arteries |
| Anterioles | Small branches formed from small arteries, taking blood to capilleries |
| Capilleries | microscopic, exchange of molecules between blood and vessels. single tunic interna |
| Capillary beds | plexuses, branching networks through tissues |
| Precapillary Sphincter | regulates blood flow, between arterioles and capillery network, circular smooth muscles. contraction (close) relaxation (open) |
| venules | Recieves blood from capillaries network, externa and interna tunics, NO MEDIAL |
| Pulmonary Circuit | Starts in left ventrical then to righ atrium, circulation of blood between heart and lungs, arteries-deoxigenated blood away from heart to the lungs, capilleries-gas exchange taking oxygen out of air ridding of CO2, return oxygenated blood to heart. |
| Systemic Circuit | starts in right ventrical then to right atria, circulating blood everywhere except blood |
| Hepatic portal system | system of veins involving liver, 2 capilleries connected by veins, absorbing nutrients from food we digest, intestinal capilleries-splenic vein-superior mesentric vein-inferior mesentric vein-hepatic portal vein-liver capillaries-hepatic viens |
| Fetal Circulation umbilical vein | Blood different from new born umbilical vein-oxigenates blood during fetal period. between cord and fetus heart (going to liver) |
| Fetal Circulation Ductus venosus | Takes blood from liver into inferior vena cava to right atrium. |
| Foramen Ovale | hole between right and left atrium, closes off after birth |
| Ductus Arteriosus | Tiny blood vessel between pulminary trunk and aeorta sending small amount of blood by passing lungs going straight to aeorta. becomes just vessels after birth. |
| Umbilical Arteries | (2), waste products need to be removed, has deoxygenated blood and waste products. mother takes from this and removes. |
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