| Term | Definition |
|---|
| Blood Vessel | Heart Arteries Arterioles Capillaries Venules Veins Heart |
| Arteries | Carry blood away from the heart |
| Veins | Carry blood toward the heart |
| Capillaries | Contact tissue cells and directy serve cellular needs |
| Tunica Intima Layers | Endothelial Layer, Subendothelial Layer, Internal Elastic Lamina |
| Tunica Media Layers | External Elastic Lamina |
| Tunics of Blood Vessels | Tunica Intima, Tunica Media, Tunica Externa |
| Tunica Internal | Endothelial Layer lines the lumen, in veins more that 1mm, a subendothelial conetive tissue basement membrane is present |
| Tunica Media | Smooth muscle and elastic fiber layer, regulated by sympathetic nervous system and controls the vasoconstriction and vasodilators |
| Tunica Externa | Collagen Fibers that protect and reinforce vessels, large vessels contains vasa vasorum |
| Elastic (conducting) Arteries | Thick- walled arteries near the heart, many elastic fibers, Large lumen allow low-resistance conduction of blood. Serve as pressure reservoir. insctive in vasocosntriction |
| Muscular (distributing) Arteries | Distal to elastic ateries: deliver blood to body organs. Have thick tunica media with more smooth muscle. Active in vasoconstriction |
| Arterioles (Smallest Arteries, lead to capillary beds) | Control flow into capillary beds via vasodilation and constriction |
| Capillaries Types | Continuous, Fenestrated and Sinusoids |
| Continous | Type of Capillarie that is on the skin and muscles. Blood-brain barrier, Uninterrupted clefts allow the passage of fluids |
| Fenestrated | Type of Capillarie that absorb of filtrate formation. Fenestrations. Small intestines, endocrine glands, and kidneys. |
| Sinusoids | Modified leaky, fenestrated capillaries with large lumenes. Liver, bone marrow, lymphoid tissue, endocrine organs. Large molecules pass Blood flow sluggishly, allowing for modificarion in various ways |
| Capillary Beds | Are the Networks of Capillaries |
| Network of Capillaries | Consist of vascular schunts |
| Vascular Shunts | Metarteriole-throughfare channel |
| Precapillary Sphincter | It regulates blood flow into the capillary. Blood flow is regulated by vasomotor nerves and local chemical |
| Venules are formed when | Capillary beds unite |
| Venules | Allow fluids and WBCs to leave the blood stream |
| Veins | Three Tunics: Thin Tunica media, thick tunica externa collagen and elastic fibers |
| Veins Capacitance | Contains 65% of the blood supply. Veins have much lower pressure and thiner walls |
| Adaptation for venous retourn | Large valves, skeletal muscle and respiratpry pump, arterial pulse |
| Venous sinuses | Specialized, flattened veins with extremely thin walls |
| Vascular Anastomoses | Merging blood vessels, more common in veins than arteries. Arterial anastomoses provide alternate pathways (collateral channels) for circulation. |
| Thoroughfare Channels | Are an example of arteriovenous anastomoses |
Combine with other sets
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