Biology 0610 · IGCSE · Gas exchange in humans

Gas exchange in humans — practice question

During exhalation, ……1…… is ……2…… via the lungs. Which words correctly fill gaps 1 and 2?

  • Acarbon dioxide; excreted
  • Bcarbon dioxide; respired
  • Coxygen; excreted
  • Doxygen; respired

Worked solution & mark scheme

This 1-mark question has a full step-by-step worked solution and mark scheme.

  • Full mark scheme, point by point
  • Step-by-step worked solution
  • Write your answer & get it marked instantly by AI