BIO271H1 Lecture 6: BIO271 2014 Lecture 6.pdf

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5 Apr 2014
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Diffusion through water or air. Start ventilating bulk flow. Sponges and cnidarian move the external medium (seawater) by bulk flow through an internal body cavity. Bulk flow of air insects use similar system to bulk flow in water. A series of hollow tubes called the trachea penetrates into all parts of the body. Animals with internal gills or lungs move the external medium by bulk flow across the respiratory surface (ventilation) No control for steps 2 and 4 diffusion just happens. Control only in circulation and ventilation. Air is a fluid has to move through tubes to get into lungs. Law of bulk flow: q= p/r: q = flow, p = pressure drop, r = resistance (due to friction) Flow is inversely proportional to the resistance (increase resistance = decrease in flow) Half the radius to get same amount of slow increase pressure by 16 times (power of 4)

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