Oppositely charged ions in solution are prevented from combining by
A) heat capacity of water.
B) hydration spheres.
C) water's nonpolar nature.
D) free radicals.
E) hydrogen bonding.
B
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Which of the following is not a way muscle contractions can be graded?
A) changing the frequency of stimulation B) changing the strength of the stimulus C) changing the type of muscle fibers involved in the contraction D) changing the type of neurotransmitter released by the motor neuron
When oxygen levels are low or absent, the cells revert to a process of:
A. aerobic metabolism. B. anaerobic metabolism. C. anaerobic anabolism. D. aerobic catabolism.
The integrative function of the nervous system is associated especially with which of the following?
A. The sensory neurons B. The afferent neurons C. The interneurons D. The efferent neurons E. The effectors
Which of the following has the lowest partial pressure in inhaled dry air?
A) oxygen B) nitrogen C) water vapor D) carbon dioxide E) mercury