In this blog post, we will share a list of the most critical questions on breathing and exchange of gases for the NEET exam.

 

Breathing And Exchange Of Gases

Breathing, or respiration, is the process by which an organism exchanges gases with its environment. This process is essential for the organism to obtain oxygen, which is necessary for the production of energy through cellular respiration. The exchange of gases occurs in specialized respiratory organs, such as the lungs in humans or gills in fish.

In humans and other mammals, the process of breathing begins when the muscles of the diaphragm contract, causing the volume of the chest cavity to increase. This increase in volume decreases the pressure inside the chest cavity, and the air is drawn into the lungs through the nose or mouth. Once the air reaches the alveoli, a network of tiny air sacs in the lungs, the oxygen in the air diffuses into the bloodstream and is carried to the cells of the body. At the same time, carbon dioxide, a waste product produced by the cells during cellular respiration, diffuses from the bloodstream into the alveoli and is exhaled out of the body.

In fish and other aquatic animals, the process of gas exchange occurs through specialized respiratory organs called gills. Water is drawn over the gills, and oxygen diffuses from the water into the bloodstream, while carbon dioxide diffuses from the bloodstream into the water.

Overall, the exchange of gases is essential for the survival of all organisms, as it allows them to obtain the oxygen necessary for energy production and to rid their bodies of waste products.

 

Breathing And Exchange Of Gases NEET Questions

1.  The process of exchanging gases between an organism and its environment is called:
a. Breathing
b. Respiration
c. Cellular respiration
d. Gas exchange
e. All of the above (a-d)
Answer: e. All of the above (a-d)

2. Which of the following is not a function of breathing?
a. Obtaining oxygen for energy production
b. Removing waste products from the body
c. Regulating body temperature
d. Transporting nutrients throughout the body
e. Maintaining pH balance
Answer: d. Transporting nutrients throughout the body

3. In humans, the process of breathing begins when the muscles of the:
a. Diaphragm contract
b. Ribcage expands
c. Nose contract
d. Mouth relax
e. Throat expand
Answer: a. Diaphragm contract

4. The exchange of gases in the lungs occurs in a network of tiny air sacs called:
a. Alveoli
b. Bronchioles
c. Trachea
d. Nasal passages
e. Larynx
Answer: a. Alveoli

5. In fish and other aquatic animals, the process of gas exchange occurs through specialized respiratory organs called:
a. Alveoli
b. Bronchioles
c. Trachea
d. Nasal passages
e. Gills
Answer: e. Gills

6. The process by which oxygen is taken up by the body and carbon dioxide is expelled is called:
a. Inspiration
b. Expiration
c. Inhalation
d. Exhalation
e. Ventilation
Answer: a. Inspiration

7. The process by which carbon dioxide is expelled from the body and oxygen is taken in is called:
a. Inspiration
b. Expiration
c. Inhalation
d. Exhalation
e. Ventilation
Answer: b. Expiration

8. Which of the following is not a component of the respiratory system?
a. Lungs
b. Trachea
c. Bronchi
d. Alveoli
e. Kidneys
Answer: e. Kidneys

9. Which of the following is not a component of the respiratory system?
a. Nose
b. Mouth
c. Larynx
d. Pharynx
e. Liver
Answer: e. Liver

10. The process of exchanging gases between the atmosphere and the body’s cells is called:
a. External respiration
b. Internal respiration
c. Oxygenation
d. Deoxygenation
e. Ventilation
Answer: b. Internal respiration

11. The process of exchanging gases between the atmosphere and the body’s cells occurs in the:
a. Lungs
b. Alveoli
c. Capillaries
d. Heart
e. Liver
Answer: c. Capillaries

12. The process of exchanging gases between the atmosphere and the body’s cells occurs through:
a. Diffusion
b. Osmosis
c. Active transport
d. Facilitated diffusion
e. All of the above (a-d)
Answer: e

13. Which of the following is not a function of the respiratory system?
a. Regulating blood pH
b. Maintaining body temperature
c. Providing oxygen to the body’s cells
d. Removing waste products from the body
e. Transporting nutrients throughout the body
Answer: e. Transporting nutrients throughout the body

14. The process of exchanging gases between the atmosphere and the body’s cells is essential for the production of energy through:
a. Digestion
b. Cellular respiration
c. Photosynthesis
d. Fermentation
e. None of the above
Answer: b. Cellular respiration

15. The partial pressure of oxygen in the atmosphere is:
a. Higher than the partial pressure of oxygen in the bloodstream
b. Lower than the partial pressure of oxygen in the bloodstream
c. The same as the partial pressure of oxygen in the bloodstream
d. Dependent on the humidity of the air
e. None of the above
Answer: a. Higher than the partial pressure of oxygen in the bloodstream

16. The partial pressure of carbon dioxide in the atmosphere is:
a. Higher than the partial pressure of carbon dioxide in the bloodstream
b. Lower than the partial pressure of carbon dioxide in the bloodstream
c. The same as the partial pressure of carbon dioxide in the bloodstream
d. Dependent on the humidity of the air
e. None of the above
Answer: b. Lower than the partial pressure of carbon dioxide in the bloodstream

17. The respiratory system helps to regulate blood pH by:
a. Removing carbon dioxide from the bloodstream
b. Adding oxygen to the bloodstream
c. Removing oxygen from the bloodstream
d. Adding carbon dioxide to the bloodstream
e. None of the above
Answer: a. Removing carbon dioxide from the bloodstream

18. The respiratory system helps to maintain body temperature by:
a. Absorbing heat from the environment
b. Releasing heat into the environment
c. Absorbing heat from the body’s cells
d. Releasing heat into the body’s cells
e. None of the above
Answer: b. Releasing heat into the environment

19. The respiratory system provides oxygen to the body’s cells by:
a. Absorbing oxygen from the atmosphere
b. Releasing oxygen into the atmosphere
c. Absorbing oxygen from the bloodstream
d. Releasing oxygen into the bloodstream
e. None of the above
Answer: a. Absorbing oxygen from the atmosphere

20. The respiratory system removes waste products from the body by:
a. Absorbing waste products from the atmosphere
b. Releasing waste products into the atmosphere
c. Absorbing waste products from the bloodstream
d. Releasing waste products into the bloodstream
e. None of the above
Answer: d. Releasing waste products into the bloodstream

 

Also Read:

Molecular Basis Of Inheritance NEET Questions

Digestion And Absorption NEET Questions