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

Anatomy & Physiology

You might also like to view...

Lymph nodes range in diameter from

A) 1 nm to 10 nm. B) 1 inch to 2 inches. C) 1 mm to 25 mm. D) 1 cm to 25 cm. E) 1 cm to 1 inch.

Anatomy & Physiology

The signal is carried from the ear to the brain by the optic nerve

Indicate whether the statement is true or false.

Anatomy & Physiology

About two-thirds of the body's fluid is within cells and is termed ________ fluid

A) intracellular B) intercellular C) extracellular D) interstitial E) vital

Anatomy & Physiology

The term "codon" refers to

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.

Anatomy & Physiology