Which of the following does not require energy expenditure?
A) net movement of potassium into the cell.
B) net movement of sodium into the cell.
C) iodine uptake by thyroid gland cells.
D) transport of hydrogen ion into the stomach lumen in association with hydrochloric acid secretion during digestion of a meal
E) both (b) and (d) above.

Question

Quizplus · Accepted Answer

The net movement of sodium into the cell occurs passively through channels down its concentration gradient, which does not require energy expenditure.

Which of the Following Does Not Require Energy Expenditure