The depolarization phase of the action potential is due to
A) Na+ ions moving into the cell.
B) K+ ions moving into the cell.
C) Na+ ions moving out of the cell.
D) K+ ions moving out of the cell.
E) both A and B.
Answer: A) Na+ ions moving into the cell.
You might also like to view...
Which of the following is not a component of the overall ejaculatory response?
a. Arterioles supplying the penis dilate, causing erection b. Smooth muscles of the prostate, ducts, and seminal vesicles contract, causing emission. c. The sphincter at the neck of the bladder tightly closes. d. Semen is expelled from the penis by rapid contractions of skeletal muscles at the base of the penis. e. Rhythmical contractions and accompanying systemic responses are associated with a pleasant sensation known as orgasm.
In a chemical reaction where an electron is exchanged from one reactant to another, the structure that loses an electron is
A. reduced. B. analyzed. C. catalyzed. D. oxidized.
A greater than normal amount of CO2 in the blood is called
A. hypercapnia. B. hypoxia. C. hyperdioxemia. D. hypodioxemia.
Yellow bone marrow is composed of ________.
A. cartilage B. adipose tissue C. areolar connective tissue D. blood-forming tissue