Repolarization of a neuron following an action potential most often requires opening of ______ channels.
Fill in the blank(s) with the appropriate word(s).
Answer: voltage-gated K+
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The general structural and functional differences between a nerve and smooth muscle cell within an individual are a result of
A. the proteome (proteins in a cell) that differ between muscle and nerve cells. B. the genome (DNA in a cell) being different between muscle and nerve cells. C. the relative amounts of certain proteins between muscle and nerve cells. D. the proteome and the relative amounts of certain proteins that differ between muscle and nerve cells. E. the genome and the relative amounts of certain proteins that differ between muscle and nerve cells.
Proteins that speed metabolic reactions might have first formed when reactants could have begun interacting inside
tiny holes in rocks near deep-sea __________. Fill in the blank(s) with the appropriate word(s).
When Dr. Schmidt-Nielsen and his colleagues followed a "pulse" of 100% inhaled oxygen through the respiratory system of an ostrich, the oxygen pulse went to the
A. posterior air sacs to the lung and then to the anterior air sacs before being exhaled. B. anterior air sacs to the lung and then to the posterior air sacs before being exhaled. C. lung and then to the anterior air sacs and finally the posterior air sacs before being exhaled. D. lung and then to the posterior air sacs and finally the anterior air sacs before being exhaled. E. lung and then back out with exhalation—the air sacs were not involved.
Visual accommodation involves the ability to ____
a. change the sensitivity of the rods and cones by means of neurotransmitters b. change the position of the retina c. change the thickness of the lens by contracting or relaxing certain muscles d. protect the eyeball from foreign matter e. prevent eye strain