At what point do the sodium gates begin to close, shutting out ...

[Mimi]

At what point do the sodium gates begin to close, shutting out further entry of sodium into the cell?
 
  a. at the peak of the action potential
 b. when the threshold is reached
 c. at the end of the relative refractory period
 d. when the concentration gradient for sodium is eliminated

Question 2

Which hormone, released by the posterior pituitary, both raises blood pressure and enables the kidneys to reabsorb water?
 
  a. vasopressin
  b. prolactin
 c. thymosin
 d. ACTH

[jessicaduplan]

Answer to Question 1

a

Answer to Question 2

a