Which of the following is an example of active transport through a cell membrane?
A) Movement of carbon dioxide out of the blood stream and into the lungs
B) Movement of oxygen from the lungs into the bloodstream
C) Movement of sweat onto the surface of your skin
D) Absorption of glucose from the gut into the bloodstream

Question

Quizplus · Accepted Answer

Absorption of glucose from the gut into the bloodstream requires active transport through the cell membranes of the gut cells. The concentration of glucose is typically higher inside the gut cells than in the surrounding environment, so energy must be expended to move glucose molecules against this concentration gradient. Option A describes passive transport through diffusion, while option B describes passive transport through a concentration gradient. Option C describes exocrine gland secretion and is not related to membrane transport.

Which of the Following Is an Example of Active Transport