Which of the following statements is/are correct? Breathing is an essential process of life because it
- brings to the blood the oxygen needed by the cells for cellular respiration
- rids the body of carbon dioxide
- promotes combination with oxygen in the lungs
- aids in the transport of carbon dioxide from the tissues
Select the correct answer from the codes given below:
-
4 alone
-
1 and 2
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1, 2 and 3
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1, 2, 3, and 4
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None of these
D
Correct answer
Explanation
All four statements correctly describe essential functions of breathing. Statement 1 is correct as breathing oxygenates blood. Statement 2 is correct as breathing removes CO2 from the body. Statement 3 refers to oxygen-hemoglobin combination in lungs. Statement 4 is correct as blood transports CO2 from tissues to lungs for exhalation. Together, these explain why breathing is vital for cellular respiration and survival.