Question

Breathing is a process that

(i) provides O₂ to the body.

(ii) breaks down food to release energy.

(iii) helps the body to get rid of CO₂.

(iv) produces water in the cells.

Which of the following gives the correct combination of functions of breathing?

• A. (a) (i) and (ii)
• B. (ii) and (iii)
• C. (i) and (iii)
• D. (ii) and (iv)

Answer 1

The correct option is C

(i) and (iii)

The correct option is option C.

Explanation for correct option:

1. The act of breathing involves taking in oxygen and releasing carbon dioxide from the body.
2. The act of physically taking in oxygen and releasing carbon dioxide is known as breathing.
3. Inspiration and expiration are the two key steps in the breathing mechanism.
4. The external intercostal muscles and the diaphragm contract during inspiration.
5. When the diaphragm and intercostal muscles relax, exhalation happens.
6. The overall amount of air inside the lungs changes along with the pressure depending on whether the muscles surrounding the lungs are contracted or relaxed.
7. Air rushes out of the lungs when the internal pressure exceeds the external pressure.
8. The air rushes in if the opposite occurs.

Final answer: Breathing is a process that (i) provides O₂ to the body; (iii) helps the body to get rid of CO₂; gives the correct combinations of functions of breathing.