Calcium entry into the presynaptic terminal will be greatest:
A. during the rising phase of the action potential
B. at the peak of the action potential
C. during the falling phase of the action potential
D. during the afterhyperpolarization following an action potential
E. when it is at its resting potential
ANS: C
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A. a three-nucleotide sequence of DNA that codes for a protein. B. an amino acid that is coded for by three bases of DNA. C. a three-base sequence of mRNA. D. the part of a rRNA molecule where a new amino acid is added. E. the part of tRNA that is a triplet of bases that forms hydrogen bonds with complementary sequences.
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A) intracellular B) intercellular C) extracellular D) interstitial E) vital
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