301HW1F090 - Because organophosphates block the action of...

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Due Oct.8 ‘09 Biology 301 Home Work # 1 Answers Fall 2009 Name Lab Section number The answers cannot be more than 4 lines. They must be written in a scientific language. Longer answers will be penalized by point deductions . 1. Cancer is abnormal, uncontrolled cell division. What property of epithelial tissues might (and does) make them more prone to developing cancer? ( 5points) Epithelia form the external as well as the internal boundaries of our body. As a result they are more vulnerable to damage, and need to be replaced frequently. Cells undergoing frequent mitosis are more likely to develop abnormal cell division. 2. Many potent insecticides contain toxins called organophosphates. Ivan is using such an insecticide and is very careless. Because he does not use gloves or a dust mask he absorbs some of the chemicals through his skin and inhales a large amount as well. What signs would you expect to observe in Ivan as a result of organophosphate poisoning? (5points)
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Unformatted text preview: Because organophosphates block the action of acetylcholineesterase, Ach released into the synaptic cleft would not be removed. It would continue to stimulate the motor end plate, causing a state of persistent contraction. Since he inhales it the muscles of respiration are affected and he could die of suffocation. 3. Many people change the natural appearance of their hair, by coloring it. Which layers of the hair do you suppose are affected by the chemicals added during these procedures? Why are the effects of the procedures not permanent? (5points) The chemicals in hair dyes break the protective covering of the cortex, allowing the dyes to stain the medulla of the shaft. Dying is not permanent because the cortex remains damaged, allowing shampoo and UV rays from the sun to enter the medulla and affect the color. The living portion of the hair remains unaffected so when the shaft is replaced the color will be lost....
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