Assertion (A): The main pulmonary artery pumps oxygenated blood from the right ventricle into the lungs.

Reason (R): Inside the lungs, the artery divides and divides several times to form capillaries around the air sacs.

1. A is True, and R is false.
2. A is False, and R is true.
3. Both A and R are true.
4. Both A and R are false.

Name the following.

1. Respiratory process in which oxygen is not utilized.
2. Respiratory process in which oxygen is utilized.
3. The microscopic air-sacs of the lungs.
4. The two membranes which protect the lungs.
5. Six main parts of the human respiratory system.
6. Two types of respiration.
7. Three phases of respiration.
8. Two steps of breathing.
9. Three common respiratory diseases.

The basic structural and functional unit of the lungs is :

1. Pleura
2. Alveolus
3. Capillary
4. Diaphragm

Describe in brief the function of ribs and diaphragm in breathing.