The diagram shows some structures in the human respiratory system.
Name structures A and B.
The table shows the level of two gases, X and Y, in blood entering and leaving the lungs during gas exchange:
| Gas | Level of gas in cm3\text{cm}^3cm3 per 100 cm3 of blood entering lungs | Level of gas in cm3\text{cm}^3cm3 per 100 cm3 of blood leaving lungs |
|---|---|---|
| X | 11.2 | 19.8 |
| Y | 54.6 | 47.3 |
Name the two gases, X and Y.
How much of gas X enters 100 cm3 of blood before the blood leaves the lungs?
Which process describes how the gas exchange takes place?
