Biology 9700 · AS & A Level · The gas exchange system

The gas exchange system — practice question

Where are cartilage and smooth muscle correctly located in the human gas exchange system?

  • Acartilage: bronchioles; smooth muscle: bronchioles
  • Bcartilage: bronchioles; smooth muscle: trachea
  • Ccartilage: trachea; smooth muscle: alveoli
  • Dcartilage: trachea; smooth muscle: bronchi

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