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5. Circulation post

5. Circulation post - Chapter 42 Circulation and Gas...

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Chapter 42 Circulation and Gas Exchange
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Circulation in Animals Diffusion is limited by distance and time 1 s for 100 um; 100 s for 1 mm; 3 hr for 1 cm Circulatory system ensures that NO cell is farther than 2 mm away from the blood supply Functionally connects the cells to reconditioning organs Lungs (gas) Alimentary canal (nutrients) Skin (temperature) Invertebrates Gastrovascular cavities Vertebrates Closed circulatory system
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Gastrovascular Cavities Circulatory system unnecessary due to small distance Cnidarians (hydras, jellies) Body wall thin (2 cells thick) Gastrovascular cavity – Digestion – Distribution Planarians (flatworms) Very thin (flat) to cut down on distance of diffusion Gastrovascular cavities with branches
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Invertebrate Circulatory Systems Components Circulatory fluid Tubes for transport Muscular pump Open Insects, arthropods, and most mollusks Hemolymph Heart Vessels Sinuses surround organs Closed Earthworms, squids, and octopuses Blood Confined to vessels Interstitial fluid
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Vertebrate Circulation Metabolic rate determines the complexity of circulatory system Organism level Organ level Cardiovascular systems Heart Atrium (a) – receives blood Ventricle (s) – pump blood Vessels Arteries Arterioles Capillaries Venules Veins
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