JAMB - Biology (2017 - No. 38)
Which of the following is an example of active transport?
Oxygen exchanging between red blood cells and liver cells
Carbon dioxide exchanging between muscle cells and red blood cells
Water moving out of the small intestine
Sodium being reabsorbed in the kidney
Forklaring
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.