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 how much?
Q.4.
The percentage of carbon dioxide in exhaled air is about how much?
Q.5.
The percentage of which of these gases of the air breathed in remains unchanged in the air that we breathe out?
Q.6.
Which is the correct order showing the route that oxygen takes to enter 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 .......