The diagram shows some structures in the human respiratory system.
a.[2]
Name structures P and Q.
b.
[1]
The table shows the level of two gases, M and N, 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 |
|---|---|---|
| M | 10.4 | 18.9 |
| N | 56.8 | 49.1 |
Name the two gases, M and N.
c.[2]
How much of gas M enters 100 cm3 of blood before the blood leaves the lungs?
d.[1]
Which process describes how the gas exchange takes place?
- active transport
- diffusion
- transpiration
- osmosis