All of the following must occur before a second action potential can begin, EXCEPT
A) the Na+ and K+ ions that moved in/out of the cell must move back to their original compartments; the Na+ inactivation gate must open; and the Na+ activation gate must close.
B) the Na+ and K+ ions that moved in/out of the cell must move back to their original compartments.
C) the absolute refractory period must occur.
D) the Na+ inactivation gate must open and the Na+ activation gate must close.
E) None of the answers are correct.
B) the Na+ and K+ ions that moved in/out of the cell must move back to their original compartments.
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Lymph nodes:
a. have one afferent vessel b. have several efferent vessels c. contain phagocytic cells d. all of the above
What muscles originate and insert on the bones of the thoracic limb?
What will be an ideal response?
Which male reproductive gland produces the majority of the volume of semen and contains fructose used by sperm cells to make ATP?
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