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animal phys 10-16-07 - Ani phys Fick's Law M=DA(a1-a2/X...

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10-16-07 Ani phys Fick’s Law: M=DA(a1-a2)/X Talk about respiration and Tuesday we talk about diver’s reflex. Remember to bring old clothes and a change of t-shirt Thursday: lungs, hemoglobin, etc This is as biophysical as you can get. (Fick’s) This is the movement of the gas through a liquid where M is the rate (how fast the gas is going), D is a diffusion constant (krogh’s) and depends on the gas, the concentration differences (a1-a2) across the membrane usually doesn’t change either unless you are climbing the Himalaya’s or diving very deep, the amount of oxygen here vs there, really isn’t going to change much. The only 2 variables are the A (diffusion are) and X (diffusion difference) if you know your algebra you know that if you make M larger, the A has to be huge or X very small or a combo of the 2. the 3 resp systems we’ll talk about you’ll see that how these different organisms try to increase one or reduce the other. Respiratory systems: 1. tracheal system (insects/spiders) 2. gills 3. lungs (Elizabeth on Thursday) Look on page 21 of handouts, bottom 3 pictures. We utilize our lungs and transfer oxygen into the body and then use a carrier system (blood cells) to take oxygen to the tissues and similar principles goes on with the fish. Insects, spiders, and their allies use a completely different system. If we want to get O2 to our heart, the oxygen has to be transported there through blood, bound to hemoglobin and dissolved in water. For insects or spiders, the air sacs go directly to the cells. This is the case of bringing the gas directly from the outside to the cells directly. On the left is the outside wall (figure) the air moves into the tube (trachea) and analogous to our trachea lined with cartilage, this insect trachea is lined with the skin of the insect (the stuff that crunches when you step on them). When the insect molts, sheds its skin, it also sheds its tracheal lining. Afterwards, the trachea will branch to form tracheols and finishing off at the tracheal end feet and where diffusion/gas exchange occurs.
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