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301HW1F09 - organophosphate poisoning(5points The...

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Due Oct.8 ‘09 Biology 301 Home Work # 1 Fall 2009 Hee-Yun Cha 0011 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) Cancer cells derived from a normal cell when it is abnormally differentiated. Thus, epithelial tissues are more likely to develop cancer since it divides more frequently than other cells in the body. Also, epithelial tissues are commonly exposed to carcinogen such as UV radiation (skin) and environmental toxins by air and ingested food. 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
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Unformatted text preview: organophosphate poisoning? (5points) The signs (visible to others) and symptom of organophosphate poisoning include muscarinic effects, nicotinic effects and CNS effects. The muscarinic signs include diarrhea, excess lacrimation, and respiratory distress. Nicotinic signs include muscle fasciculations, mydriasis, and pallor. CNS effects include tremors, seizures, and coma. 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 hair color pigment, melanin, is located in the cortex of the hair shaft. When the hair is dyed, small color pigment molecules slip into the hair shaft to add or remove color of the melanin in the cortex. Hair coloring is not permanent because new melanin pigments replace the color changed old melanin....
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