NPTE Physical Therapist Exam Review

Category - Physical Therapy

What is the movement of oxygen across a cell membrane called?
  1. Concentration gradient
  2. Osmosis
  3. Diffusion
  4. Dissociation
Explanation
Answer: C - The movement of oxygen across a cell membrane is called diffusion. The concentration gradient is what causes this process to occur, as the pressure of gas outside the membrane exceeds that inside the membrane.
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