Question

Which of the following correctly defines the functions of breathing?
(i) It provides oxygen to the body.
(ii) It breaks down food to release energy.
(iii) It helps the body to get rid of carbon dioxide.
(iv) It produces water in the cells.

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

Answer 1

The correct option is D (i) and (iii)

Breathing is the process of moving air in and out of the lungs to facilitate gas exchange in the body. We breathe to get oxygen to our cells, so that they can use oxygen to make cellular energy (ATP). The by-product of the energy production i.e. carbon dioxide is removed from the cells and through the lungs in a similar manner via breathing.