B100m1w07 - BIPN 100 Mammalian Physiology I Name st Winter...

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BIPN 100, Mammalian Physiology I Name: _________________________________ Winter, 2007 1 st Midterm Exam I.D. #: _________________________ February 2, 2007 Page 1 1. (21 points). About 2 weeks ago a radio station ran a contest: who can drink the largest amount of water without urinating. A woman called to say she had drunk over 2 gal. and was feeling sick. A short time later she died (true story!). The family is suing the DJs and the radio station. The normal average total body water in women is ~30 L, of which ~20 L is inside cells, ~3 L is in plasma and ~7 L is in the interstitial fluid. One gallon = 3.785 L. Indicate what happenned to the following parameters that contributed to or caused her death. Answer (increased, decreased, or no change) or (depolarized, hyperpolarized, or no change) where appropriate and give the reason for your answer. A. Plasma osmolarity: ______________ because: The osmorreceptors are in the: ________________ , which responded by: ______________ secretion of: ___________________ , which caused the kidneys to: ____________ water reabsorption. B. Cell volume: ______________ , because: C. Resting potentials of excitable cells: ______________, because: D. Threshold for action potentials: ________________, because: E. Peak amplitude of action potentials: ______________, because:
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