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Final Exam 2009 Key

Final Exam 2009 Key - NameandHUID Life Sciences 2 Midterm#3...

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Name and HUID p. 1 Life Sciences 2 Midterm #3 Question # Points #1 #2 #3 #4 #5 #6 #7 #8 #9 #10 #11 #12 #13 #14 Total
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Name and HUID p. 2 1) How do higher primates see the color red and what is the evolutionary significance of this ability? (2 points) 1 pt. – primates have cones that respond to red wavelengths of light 1 pt. – this allows them to determine when fruit is ripe and when leaves are tender; also helps to see details and other things rich in color (e.g poisonous insects) 2) Name two sensory organs that utilize hair cells and briefly describe where those hair cells are located in each organ. (2 points) 1 pt – the cochlea utilizes hair cells and these cells are located in the Organ of Corti 1 pt – Hair cells are located in the semicircular canal, the saccule and the utricle in the ampulla 3) Name the embryonic germ layer that develops into the epithelial lining of the mouth and the germ layer that develops into the epithelial lining of the digestive tract. (2 points) 1 pt – the epithelial lining of the mouth is derived from the ectoderm 1 pt – the epithelial lining of the digestive tract is derived from endoderm 4) Name the two major cell types in the stomach and describe what each of them synthesize and secrete. (2 points) 1 pt – chief cells in the stomach secret pepsinogen 1 pt – parietal cells in the stomach secrete HCl 5) What is the primary source of heat gain and the primary source of heat loss in all terrestrial mammals during exercise? (2 points) 1 pt – the primary source of heat gain is metabolic heat gain (0.5 points for muscle contraction 1 pt – the primary source of heat loss is evaporative water loss (0.5 points for sweating because not all mammals sweat) 6) What is the thermoneutral zone and what is its significance? (2 points) 1 pt – the thermoneutral zone is the area of the metabolic rate versus ambient temperature curve that is flat (i.e. no change in MR with change in temperature) 1 pt – in the thermoneutral zone physiological and behavioral mechanisms can be used to maintain a stable internal temperature and metabolic rate does not have to increase 7) What signal causes the release of ADH, and on what part of the nephron does ADH act? (2 points)
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Name and HUID p. 3 1 pt – an increase in osmolarity or dehydration or a decrease in blood pressure or blood volume (any of these are correct) stimulates the release of ADH 1 pt – ADH acts on the medullary collecting duct 8) What is the fate of the mesonephric tubules in an embryo that retains the Wolffian ducts? Will this embryo develop into a male or female? (2 points) 1 pt – the mesonephric tubules will become the seminiferous tubules 1 pt – the embryo will develop into a male 9) What happens to the osmolarity of the extracellular space as the loop of Henle extends deeper into the medulla? What happens to the osmolarity of the filtrate within the loop of Henle as it travels deeper into the medulla? (2 points) 1 pt – the osmolarity of the extracellular space will increase as the loop of Henle extends deeper into the medulla
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