Circulation & Blood 08 part 1

Circulation & Blood 08 part 1 - Circulatory Systems...

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1 Circulatory Systems (Chap. 42) Types of circulatory systems (pgs. 808-810) (pgs. 815-816) (figs. 42.8 & 42.16) Vertebrate heart (pgs. 816-821) (figs. 42.11) Blood vessel structure (fig. 42.6) Blood pressure (pgs 821-824) Movement of fluid in caps. (fig. 42.20) Lymphatic system (pgs. 826-828) (fig. 42.18) DIFFUSION can accommodate the metabolic needs of very small animals Amoeba Hydra Single cell Two cell layers Diffusion Diffusion Let’s stir the beaker
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2 Let’s stir the beaker Let’s stir the beaker BULK FLOW leads to immediate equilibration What is DIFFUSION? start intermediate equilibrium How fast is DIFFUSION? Diffusion Time required distance (um) for diffusion 10 . 5 m s e c 10 50 msec 100 5 sec 1,000 (1 mm) 8.3 minutes 10,000 (1 cm) 14 hrs CONCLUSION??
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3 CONCLUSION: 1. DIFFUSION can accommodate the metabolic needs when distances are small Amoeba Hydra Diffusion Diffusion 2. For larger animals, there must be convective flow and bulk flow 3. Whenever diffusion is used there is adaptation of decreased distances & increased area available for diffusion
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Circulation & Blood 08 part 1 - Circulatory Systems...

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