Question

Q3. Which of the following statements are true about respiration

a. During inhalation , ribs move inward and diaphragm is raised
b. In alveoli exchange of gases takes place Ie oxygen from blood into alveolar air l
c. Haemoglobin has greater affinity for carbon dioxide than oxygen
d. Alveoli increase the surface area for absorption of gases
Options-
i. a & d ii. b & c iii. a & c iv. b & d

Answer 1

Answer:

During inhalation, diaphragm is lowered and ribs move outward resulting in increased volume of lungs so airs rushes in. Exchange of gases occur in alveoli.

Answer 2

Answer:

Option d

Explanation:

Alveoli increase the surface area for absorption of gases