Which of the following is an example of active ... - JAMB Biology 2017 Question
Which of the following is an example of active transport?
A
Oxygen exchanging between red blood cells and liver cells
B
Carbon dioxide exchanging between muscle cells and red blood cells
C
Water moving out of the small intestine
D
Sodium being reabsorbed in the kidney
correct option: a
Although sodium ions are small, their charge prevents them from moving across the cell membrane through simple diffusion. They must be transported using active transport.
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