Which of the following statement(s) is (are) true about respiration?
1. During inhalation, ribs move inward and diaphragm is raised
2. 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
3. Haemoglobin has greater affinity for carbon dioxide than oxygen
4. Alveoli increase surface area for exchange of gases
The tiny air-sacs at the end of the smallest bronchioles are known as Alveoli. Alveoli provides a large surface area for the exchange of gases.