Question

Which of the following statement(s) is (are) true about respiration?

• A. During inhalation, ribs move inward and diaphragm is raised
• B. In the alveoli, exchange of gases takes place i.e., oxygen from alveolar air diffuses into blood and carbon dioxide from blood into alveolar air
• C. Alveoli increase surface area for exchange of gases
• D. Both B and C

Answer 1

The correct option is D Both B and C

The percentage of carbon dioxide transported by hemoglobin is lesser than the carbon dioxide transported in dissolved state by plasma. The alveoli of the lungs increase the surface area for an efficient gaseous exchange between blood and alveolar air. The alveoli have thin walls made up of a single layer of an epidermis which allows easy exchange of gases.

So, the correct answer is option D.