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

Question

Quizplus · Accepted Answer

Net movement of sodium into the cell is a passive process that does not require energy expenditure. It occurs by diffusion down its concentration gradient. The other options all involve active transport mechanisms that require energy expenditure.

Which of the Following Does NOT Require Energy Expenditure