Lab 7 - Paul Gonzales BIO206L Lab 7 1 a Chelipeds-first...

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Paul Gonzales BIO206L Lab 7 1. a) Chelipeds-first pair of walking legs that has large pincers that are used for grasping and tearing food and for defense b) Walking legs- used for walking, food gathering, and moving water over the gills c) Maxillapeds-manipulate food toward the mouth and each bears a gill d) Mandibles-jaws, used for chewing or grinding e) Genital pore- during copulation, sperms are shed through the genital pore and transferred to the space near the ventral part of a female (called the oviduct) gential pore where fertilization occurs f) Nephridiopore- pores which nitrogenous wastes are excreted g) Eye-enables crayfish to see objects seen as a mosaic using facts that provide a larger field of view with decreased resoution h) Uropod/telson- flipper-like tail used in swimming and escape responses 2. From the mouth through the esophagus to the cardiac stomach, food is ground up by digestive enzymes with the help of a gastric mill. Then food travels to the pyloric stomach to be filtrated and nutrients are absorbed into the blood stream and digestive gland. Food is then expelled by traveling from the intestines to the anus or hindgut. Finally the green glands filter fluid waste from the blood through nephridiopores. This makes sense because the green glands are located anterior to the esophagus so that when the crayfish swims forward, the waste from the blood (Ammonia) is released to the back of the crayfish. As with the green glands, the anus being located in the rear end of the crayfish allows waste to be left from the direction the crayfish is swimming. 3. First the organism would be recognized by the compound eyes of the crayfish.
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This note was uploaded on 03/15/2010 for the course BIO 49540 taught by Professor Robertfarris during the Spring '10 term at University of Texas.

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Lab 7 - Paul Gonzales BIO206L Lab 7 1 a Chelipeds-first...

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