Bio_1A_Lecture_16_Heart - OUTLINE of the Cardiovascular...

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Unformatted text preview: OUTLINE of the Cardiovascular System Principle of Diffusion need for bulk Fow optimizing diffusion Heart - muscular pump with valves coronary blood supply excitation cardiac output = heart rate x stroke volume Structure of blood vessels functional activity of blood vessels related to geometry arteries - thick walled; wrapped in smooth muscle microcirculation - business end of circulation; where exchange occur veins - thinner walls; some muscle; valves Activity of CV system regulated by nerves and hormones DIFFUSION can accommodate the metabolic needs of very small animals Lets stir the beaker. How fast is DIFFUSION? What is DIFFUSION? start equilibrium Diffusion distance ( m) Time required for diffusion 1 10 100 1,000 (1 mm) 10,000 (1 cm) 0.5 msec 50 msec 5 seconds 8.3 minutes 14 hours CONCLUSION??? intermediate Diffusion is fast at small distances & slow at large distances 1. DIFFUSION can only accommodate metabolic needs when distances are small 2. For larger animals, there must be convective...
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This note was uploaded on 10/29/2009 for the course BIO biology taught by Professor Meighan during the Fall '09 term at University of California, Berkeley.

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Bio_1A_Lecture_16_Heart - OUTLINE of the Cardiovascular...

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