3.
|
The percentage of carbon dioxide in inhaled air is ....... |
|
[ ] |
0.03% |
[ ] |
4% |
[ ] |
21% |
[ ] |
79% |
|
|
4.
|
The percentage of carbon dioxide in exhaled air is ....... |
|
[ ] |
4% |
[ ] |
16% |
[ ] |
21% |
[ ] |
79% |
|
|
5.
|
The percentage of which gas remains unchanged? |
|
[ ] |
Carbon dioxide |
[ ] |
Nitrogen |
[ ] |
Oxygen |
[ ] |
Water vapor |
|
|
6.
|
Which is the correct order showing how oxygen enters the blood? |
|
[ ] |
Alveoli, bronchioles, bronchi, trachea |
[ ] |
Bronchi, bronchioles, trachea, alveoli |
[ ] |
Trachea, alveoli, bronchi, bronchioles |
[ ] |
Trachea, bronchi, bronchioles, alveoli |
|
|
7.
|
Gas exchange takes place in the alveoli. Which is not true? |
|
[ ] |
The alveoli have a moist surface |
[ ] |
The alveoli have a small surface area |
[ ] |
The alveoli have a very good blood supply |
[ ] |
The alveoli have very thin permeable walls |
|
|
8.
|
Oxygen passes from the alveoli into the blood. How is it transported? |
|
[ ] |
By blood plasma |
[ ] |
By dissolving in water |
[ ] |
By red blood cells |
[ ] |
By white blood cells |
|
|
9.
|
Carbon dioxide passes into the alveoli from ....... |
|
[ ] |
arteries |
[ ] |
blood plasma |
[ ] |
platelets |
[ ] |
white blood cells |
|
|
10.
|
Air can enter and leave the lungs because ....... |
|
[ ] |
of pressure changes |
[ ] |
the volume of the thorax (chest) remains the same |
[ ] |
there is gas exchange |
[ ] |
there is no pressure change |
|
|