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BREATHING AND EXCHANGE OF GASES
Practice MCQ's
1. Which gas is exchanged primarily in the process of respiration?
a) Nitrogen b) Oxygen c) Carbon dioxide d) Hydrogen.
2. In the human body, what organ is responsible for the exchange of gases?
a) Liver b) Heart c) Lungs d) Stomach.
3. During the act of inhalation, what does the diaphragm do?
a) Contracts and moves up b) Contracts and moves down c) Relaxes and moves up d) Relaxes and moves down.
4. The small air sacs in the lungs, where gas exchange takes place, are known as:
a) Alveoli b) Bronchi c) Trachea d) Pharynx.
5. The waste gas produced during cellular respiration is:
a) Oxygen
b) Nitrogen c) Carbon dioxide d) Hydrogen.
6. Which organ is primarily responsible for gas exchange in the human body?
a) Liver b) Kidneys c) Lungs d) Heart.
7. During inhalation, what happens to the diaphragm?
a) It relaxes and moves upward b) It contracts and moves upward c) It relaxes and moves downward d) It contracts and moves downward.
8. The primary transportation of oxygen in the blood is achieved through:
a) Hemoglobin b) Plasma c) Platelets d) White blood cells.
9. In which direction does gas exchange occur between the alveoli and
capillaries in the lungs?
a) Oxygen moves from alveoli to capillaries, and carbon dioxide moves from capillaries to alveoli. b) Oxygen moves from capillaries to alveoli, and carbon dioxide moves from alveoli to capillaries. c) Both oxygen and carbon dioxide move from alveoli to capillaries. d) Both oxygen and carbon dioxide move from capillaries to alveoli.
