________ is the principal enzyme for breaking down carbohydrates.
Fill in the blank(s) with the appropriate word(s).
Amylase
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The ease with which the lungs stretch in response to changes in pressure is termed ________.
Fill in the blank(s) with the appropriate word(s).
Which type of tooth can have 2 roots?
a. cuspids b. bicuspids c. molars d. both b and c
In some cells, an afterpotential occurs because
A. the sodium ions continue to enter the cell after depolarization is finished. B. there is prolonged, elevated permeability to potassium during repolarization. C. the sodium-potassium pump is actively exchanging ions across the membrane. D. the extracellular Na+ ion concentration is reduced. E. the permeability to sodium continues longer than necessary.
During a race, a long-distance runner twisted his ankle. He finished the race without feeling any pain in his ankle. This lack of the perception of pain could be the result of an increase in
A. gonadotropins. B. lipotropins. C. somatotropins. D. epinephrine. E. beta endorphins.