| Term | Definition |
|---|
| three major types of vessels | arteries, capillaries, veins |
| capillaries contact | tissue cells and directly serve cellular needs |
| three tunics | tunica interna, tunica media, tunica externa |
| lumen | central blood containing space surrounded by tunics |
| composition of capillaries | endothelium with sparse basal lamina |
| tunica interna | endothelium layer that lines the lumen of all vessels |
| subendothelial connective tissue | present in vessels larger than 1 mm |
| tunica media | controls vasoconstriction and vasodilation |
| tunica externa | collagen fibers that protect and reinforce vessels |
| elastic arteries | thick walled, near hart, aorta, and its major branches |
| muscular arteries | distal to elastic arteries, deliver blood to body organs |
| arterioles | smallest arteries, lead to capillary bed |
| capillaries | smallest blood vessels |
| types of capillaries | continuous, fenestrated, sinusoids |
| continuous capillaries | abundant in skin and muscles |
| fenestated capillaries | found where active capillary absorption or filtrate formation occurs |
| sinusoids | highly modified leaky fenestrated capillaries wit large lumens |
| capillary beds | a micocirculation of interwoven networks of capillaries |
| precapillary sphincter | cuff or smooth muscle that surrounds each rue capillary |
| regulation of blood flow | vasomotor nerves and local chemical conditions |
| venules | formed when capillary beds unite |
| post capillary venules | smallest venules, composed of endothelial and few pericytes |
| venous sinuses | specialized flattened veins w/ extremely thin walls |
| arterial anastomoses | provide alternative pathways for blood to reach a given body region |
| blood pressure | found per unit area exerted on the wall of a blood vessel by its contained blood |
| arterial bp | effects elasticity and amount of blood forced into them at any given time |
| systolic pressure | pressure exerted on arterial walls during ventricular contraction |
| diastolic pressure | lowest level of arterial pressure during a ventricular cycle |
| vital signs | pulse and blood pressure along with respiratory rate and body temp |
| pulse | pressure wave caused by the expansionand recoil of elastic arteries |
| hypotension | low bp in which systolic pressure is below 100mm Hg |
| hypertension | condition of sustained elevated arterial pressure of 140/90 or higher |
| acute hypotension | important sign of circulatory shock |
Combine with other sets
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