Gas exchange

The diagram shows some structures in the human respiratory system.

A diagram of the human respiratory system. Label A points to a bronchiole. Label B points to the alveoli at the end of the bronchioles.

Name structures A and B.

[2]

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 $cm3\text{cm}^3$ per 100 cm³ of blood entering lungs	Level of gas in $cm3\text{cm}^3$ per 100 cm³ of blood leaving lungs
X	12.1	20.2
Y	52.7	46.4

Name the two gases, X and Y.

[2]

How much of gas X enters 100 cm³ of blood before the blood leaves the lungs?

[2]

Which process describes how the gas exchange takes place?

[1]

Gas exchange Questions