Respiration 3April

Respiration 3April - Respiration (Chap. 44) Respiration The...

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1 Respiration (Chap. 44) Respiration – The exchange of gases between an organism and its environment Cellular respiration: Fuel + O 2 CO 2 + ENERGY Organismic respiration: O 2 in: CO 2 out DIFFUSION can accommodate the metabolic needs of very small animals Amoeba Hydra Single cell Two cell layers Diffusion Diffusion
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2 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?? Fick’s Law of Diffusion Rate of Diffusion = Area x Concentration Distance What is the strategy in the evolution of the respiratory apparatus? available surface area distance required for diffusion Respiratory medium (Air vs Water) Air: Advantage Molecular oxygen Diffusion Energy
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3 Respiration: Simple Diffusion Small aquatic organisms Sponges Hydras Flatworms Four major Types of Respiratory surfaces 1. Body surface 2. Tracheal tubes 3. Gills 4. Lungs Nudibranch Annelids Amphibians 1. Body Surface High surface to volume ratio Low metabolic rate Mucus
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This note was uploaded on 04/06/2008 for the course BIO 102 taught by Professor Brey during the Spring '08 term at Rutgers.

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Respiration 3April - Respiration (Chap. 44) Respiration The...

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