Packet 6 - Circulatory Function (3) Flashcards
Cardiac Cycle
Blood Vessels
Smooth muscle that constricts to control vessel diameter; enables vessels to constrict and relax to adjust blood flow to meet varying needs of body tissues/organs.
a. ) tunica media
b. ) tunica externa
c. ) tunica intima
a.) tunica media
Smooth muscle that constricts to control vessel diameter; enables vessels to constrict and relax to adjust blood flow to meet varying needs of body tissues/organs.
tunica externa → outer layer
tunica media → middle layer
tunica intima → inner layer
Blood Vessels
Endothelial cells that provide smooth, slippery surface to prevent platelet adherence and blood clotting. Once thought to be simple lining, now known to synthesize/activate and/or remove enzymes, factors, other vasoactive substances that affect vasoconstriction, vasodilation, platelet aggregation, etc.
a. ) tunica media
b. ) tunica externa
c. ) tunica intima
c.) tunica intima
Endothelial cells that provide smooth, slippery surface to prevent platelet adherence and blood clotting.
Prevents artherosclerosis & MI
Once thought to be simple lining, now known to synthesize/activate and/or remove enzymes, factors, other vasoactive substances that affect vasoconstriction, vasodilation, platelet aggregation, etc.
tunica externa → outer layer
tunica media → middle layer
tunica intima → inner layer
Blood Vessels
Fibrous connective tissue to support vessel.
a. ) tunica media
b. ) tunica externa
c. ) tunica intima
b.) tunica externa
Fibrous connective tissue to support vessel.
tunica externa → outer layer
tunica media → middle layer
tunica intima → inner layer
Return blood to the heart & serves as storage vessels.
a. ) Arteries & Arterioles
b. ) Capillaries
c. ) Venules & Veins
c.) Venules & Veins
Return blood to the heart (assisted by venous valves, and “milking” action of skeletal muscles.
Serves as storage vessels.
Have thick, elastic walls, since they are under higher pressure.
a. ) Arteries & Arterioles
b. ) Capillaries
c. ) Venules & Veins
a.) Arteries & Arterioles
Have thick, elastic walls, since they are under higher pressure.
Carry oxygenated blood to tissues
Thin walls, distensible so they can serve as a reservoir.
a. ) Arteries & Arterioles
b. ) Capillaries
c. ) Venules & Veins
c.) Venules & Veins
Thin walls, distensible so they can serve as a reservoir.
Much lower pressure than arteries.
Distensible = to become larger and rounder because of pressure from inside
Carry oxygenated blood to tissues.
a. ) Arteries & Arterioles
b. ) Capillaries
c. ) Venules & Veins
a.) Arteries & Arterioles
Carry oxygenated blood to tissues.
Have thick, elastic walls, since they are under higher pressure.
Provide site for transfer of gases, nutrients, and wastes.
a. ) Arteries & Arterioles
b. ) Capillaries
c. ) Venules & Veins
b.) Capillaries
Provide site for transfer of gases, nutrients, and wastes.
Thin walls (only single layer of endothelial cells thick). Small size, but large surface area to ensure adequate exchange of nutrients, gases, and wastes between tissues and blood.
a. ) Arteries & Arterioles
b. ) Capillaries
c. ) Venules & Veins
b.) Capillaries
Thin walls (only single layer of endothelial cells thick). Small size, but large surface area to ensure adequate exchange of nutrients, gases, and wastes between tissues and blood.
