After the peak of an action potential, what prevents sodium ions ...

[craiczarry]

After the peak of an action potential, what prevents sodium ions from continuing to enter the cell?
 
  a. There is no longer a concentration gradient for sodium.
 b. The sodium-potassium pump greatly increases its rate of activity.
  c. All the available sodium ions have already entered the cell.
 d. The sodium gates in the membrane close.

Question 2

Diabetes insipidus literally means passing without taste because the urine is produced in such large quantities that it is tasteless. This disease is most likely caused by a problem with the production or release of ____.
 
  a. renin
 b. vasopressin
 c. angiotensinogen
 d. prostaglandins

[nital]

Answer to Question 1

d

Answer to Question 2

b

[craiczarry]

Thanks for the timely response, appreciate it

[bimper21]

Great answer, keep it coming