Circulation I - Circulation I A. Protozoans and Simple...

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Circulation I A. Protozoans and Simple multicellular animals 1. Protozoans- simple diffusion 2. Sponges- simple diffusion 3. Cnidarians-gastrovascular cavity, simple diffusion 4. Ctenophores- gastrovascular cavity, simple diffusion 5. Flatworms- gastrovascular cavity, simple diffusion 6. Nematodes- alimentary canal, simple diffusion B. Open and Closed circulatory system 1. Circulatory system a. pumping organ- heart b. blood (closed circ. System) or hemolymph (open circ. System) c. blood vessels (closed) or hemocoels (open) 2. Open Circulatory systems a. arthropods
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b. most mollusks 3. Closed circulatory systems a. some mollusks- squid, octopi b. proboscis worms c. annelids d. chordates C. Circulation in vertebrates 1. Arteries- carries blood away from heart
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a. three layers of tissue - endothelium- epithelial tissue, smooth squamous - smooth muscle with elastic fibers (flexible support), involuntary, can contract diameter - connective tissue with elastic tissue 2. Veins- carry blood to the heart
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This note was uploaded on 04/07/2008 for the course BS 131 taught by Professor Smith during the Spring '08 term at University of the Sciences in Philadelphia.

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Circulation I - Circulation I A. Protozoans and Simple...

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