Biology for IGCSE & O level - Movement Into And Out Of Cells (Section 1 - No. 30)
Which of the following is the best example of diffusion?
The movement of oxygen from the lungs into the bloodstream.
The uptake of glucose by cells in the small intestine.
The transport of sodium ions across a cell membrane.
The movement of water across a cell membrane.
Explanation
Diffusion is the movement from high to low concentration, such as oxygen in the lungs to the bloodstream.
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