Biology 0610 · IGCSE · Gas exchange in humans

Gas exchange in humans — practice question

The diagram illustrates the exchange of gases during breathing and during respiration 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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