Which of the Following Is an Example of Active Transport

Multiple Choice

Which of the following is an example of active transport through a cell membrane?

A) movement of carbon dioxide out of the bloodstream 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) The movement of chlorine ions from an area of low concentration on one side of the membrane to an area of high concentration on the other side of the membrane.