The diagram indicates three features present in the tissues of the gas exchange system. Which structures of the gas exchange system could be represented at position X and at position Y in the diagram? 1 bronchiole 2 trachea 3 bronchus
- AX: 1, Y: 2 and 3
- BX: 1 and 3, Y: 2
- CX: 2, Y: 1 and 3
- DX: 2 and 3, Y: 1