Which of the following is an example of active transport through a cell membrane?
A. 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.
B. movement of sweat onto the surface of your skin
C. movement of oxygen from the lungs into the bloodstream
D. movement of carbon dioxide out of the bloodstream and into the lungs
Answer: A
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