Q.1.
The percentage of oxygen in the air breathed in is .......
Q.2.
The percentage of oxygen in the air breathed out is .......
Q.3.
The percentage of carbon dioxide in inhaled air is .......
Q.4.
The percentage of carbon dioxide in exhaled air is .......
Q.5.
The percentage of which gas remains unchanged?
Q.6.
Which is the correct order showing how oxygen enters the blood?
Q.7.
Gas exchange takes place in the alveoli. Which is not true?
Q.8.
Oxygen passes from the alveoli into the blood. How is it transported?
Q.9.
Carbon dioxide passes into the alveoli from .......
Q.10.
Air can enter and leave the lungs because .......