B100W04m1

B100W04m1 - BIPN 100, Mammalian Physiology I Name: _ st...

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BIPN 100, Mammalian Physiology I Name: _________________________________ Winter, 2004 1 st . Midterm Exam I.D. #: _________________________ January 30, 2004 Page 1 1. (16 points). Epithelial cells in the small intestine and kidney tubules normally absorb all the glucose from the lumen to the interstitial fluid, which requires proper function of a primary active transporter, a secondary active transporter, and a facilitated diffusion transporter. A). List, in the spaces below, the names of the transporters, the substrate(s) they transport, their energy source for net transport, and, for each transporter, the direction(s) of net transport (from where to where) between the three compartments: lumen, cells, interstitial fluid. Name: substrate(s): energy source: direction(s) of transport: i. ii. iii. B). During hyperglycemia, as in uncontrolled diabetes mellitus, when plasma glucose exceeds about 300 mg/100ml not all the glucose is reabsorbed by the kidneys and glucose appears in the urine. Briefly explain the mechanism of this glucosuria in terms of the properties of one of the transporters. 2. (16 points). A giant axon of a squid is incubated at 37 C under the following conditions: Ion: Inside Concentration (mM): Extracellular Concentration (mM):
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This note was uploaded on 10/28/2010 for the course BIPN 100 taught by Professor French during the Winter '07 term at UCSD.

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B100W04m1 - BIPN 100, Mammalian Physiology I Name: _ st...

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