Vessels
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Created by:
kaylabean098 on February 23, 2012
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Description:
Cardiovascular System Ch. 21
2nd Lecture
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35 terms
Terms | Definitions |
|---|---|
 Arteries | Carry blood away from heart Carry O2 Snap back in shape due to elastic fibers |
| Capillaries | Smallest of blood vessels for nutrients and gas exchange |
| Veins | Carry blood to heart - valves for gravity Carry deO2 |
| Tunica Intima | Endothelium Internal elastic layer Continuos w/ endocardium |
| Tunica Media | External elastic membrane Circular sheets of smooth muscle Maintain blood pressure (artery) Tolerates huge pressure change |
| Tunica Externa (Adventitia) | Connective tissue sheath Nerves, small blood vessels *Relatively thick in veins |
| Tunica Media | Layer maintains blood pressure ( elastic artery) by distributing the energy of systolic pressure |
| Tunica Media | Layer contains circular sheets of smooth muscle |
| Tunica Intima | Layer contains endothelium |
| Tunica Intima | Layer is continuous w/ endocardium |
| Tunica Externa | Layer contains nerves and small blood vessels |
| Tunica Externa | Layer is relatively thick in veins |
| Tunica Externa | layer contains connective tissue sheath |
| Artery | Snaps back in shape due to elastic fibers contraction relaxation control diameter |
| Veins | contain valves - work against gravity |
| Vasoconstriction | contraction of smooth muscle decreases diameter |
| Vasodilation | relaxation of smooth muscle increases diameter |
| Elastic Arteries | tolerates huge pressure change in tunica media |
| Elastic Arteries | distributes energy of systolic pressure spikes in tunica media |
| Muscular Arteries | more muscular layer in tunica media |
| Elastic Artery measure | D: 1.5 cm T: 1 mm |
| Muscular Artery | D: 6 mm T: 1 mm |
| Arteriole | D: 37 um T: 6 um |
| Arteriole | resistance vessels, decrease diameter which increase resistance and blood pressure |
| Arteriole | vessel has poorly defined tunica externa and tunica media is 1-2 layers |
| Arteriole | changes in diameter due to hormonal or nervous stimulation |
| Muscular Arteries | distributes blood to tissues- 'distribute arteries |
| Elastic Arteries | transports large volumes of blood away from heart - 'conducting arteries' |
| Elastic Arteries | another name for conducting artery |
| Muscular Arteries | pressure point to stop bleeding |
| Arterioles | smallest blood arteries |
| Artery to Arteriole to Capillary to Venules to Veins | order of vessel blood flow |
| Tunica Interna - Internal Elastic membrane - Tunica Media - External Elastic membrane - Tunica Externa | layers of vessel inner to outer including elastic membrane |
| Elastic Arteries | transport larve volume of blood away from heart |
| Elastic Arteries | tunica media contains lost of elastic fiber and little smooth muscle for cardiac cycle |
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