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

The diagram given alongside shows the "Human Respiratory System". Study the same and answer the following questions :

(i) Label the guidelines 1 to 4.

(ii) Define the structure shown as part 2.

(iii) Name the basic structural and functional unit of part 3.

(iv) Write one specific structural feature of the inner lining of part 1.

(v) What is the muscular sheet on which part 3 rests ?

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.

Write one important role of each of the following .

1. Epiglottis
2. Larynx
3. Alveolus
4. Pleura
5. Nasal chamber