Which of the following changes have the potential to dramatically affect the potential difference across the plasma membrane?
A. increased permeability of the membrane to sodium ions
B. increased intracellular concentration of potassium ions
C. any change in the rate at which the sodium-potassium pump works
D. increased permeability of the membrane to sodium ions and increased intracellular concentration of potassium ions
E. increased permeability of the membrane to sodium ions, increased intracellular concentration of potassium ions and any change in the rate at which the sodium-potassium pump works
D
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Which one of the following is not a typical phonotactic possibility of General American English?
a) [sk] at the beginning of a word or syllable b) [?z] at the end of a word or syllable c) [lt] at the beginning of a word or syllable d) [mp] at the end of a word or syllable
The rubrospinal tracts originate in the
A) primary motor cortex. B) vestibular nuclei. C) thalamus. D) red nuclei. E) reticular formation.
Insulin causes adipose tissue to
A. stimulate lipolysis and inhibit lipogenesis. B. inhibit lipolysis and stimulate lipogenesis. C. stimulate both lipolysis and lipogenesis. D. stimulate lipolysis and gluconeogenesis.
Which of the following events in the chloride shift occurs last?
A. CO2 and H2O ? H2CO3 B. Carbonic acid dissociates to form bicarbonate and H+. C. Carbonic acid dissociates to form water and CO2. D. Bicarbonate ions diffuse into the plasma. E. Carbon dioxide diffuses into a red blood cell.