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Cardiovascular System:

Cardiovascular System:. Blood Vessels. Arteries. Carry blood away from heart to tissues Lined w/ thick layers of muscle, elastic fibers & endothelium Lumen= space in the middle where the blood flows Nervous & endocrine system controls diameter- vasodilation, vasoconstriction. Arterioles.

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Cardiovascular System:

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  1. Cardiovascular System: Blood Vessels

  2. Arteries • Carry blood away from heart to tissues • Lined w/ thick layers of muscle, elastic fibers & endothelium • Lumen= space in the middle where the blood flows • Nervous & endocrine system controls diameter- vasodilation, vasoconstriction

  3. Arterioles • Arteries branch off into smaller & smaller arteries and then even smaller arterioles • deliver blood to capillaries • Arteries= freeways • Arterioles= exit ramps • Capillaries= surface streets

  4. Capillaries • Connect arterioles to venules • Microcirculation: surround every cell • Needs of tissue determine extent of capillary network • Nutrient and gas exchange • Walls are one cell thick

  5. Venules • Several capillaries unite to form a venule • Collect blood from capillaries and drain into veins • Venules= on-ramp>>Veins= freeway (opp. direction)

  6. Veins • Return blood from tissues to heart • Same layers as arteries but walls are thinner, esp. muscular layer • Valves prevent backflow

  7. Effects of exercise on cardio-vascular system http://w3.ouhsc.edu/phar5442/Lectures/Cardiovascularexerciseeffects.html

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