Biology 0610 · IGCSE · Gas exchange in humans

Gas exchange in humans — practice question

The diagram shows the exchange of gases while breathing and respiration are taking place in the body. What do X and Y represent?

  • AX: lungs, Y: air
  • BX: lungs, Y: body cells
  • CX: body cells, Y: air
  • DX: body cells, Y: lungs

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