Name the following :

(a) The energy currency of the cell.

(b) The compound formed by the combination of oxygen and haemoglobin.

(c) The common passage of Oesophagus and Trachea.

(d) The muscles found between the ribs which can change the size of the chest cavity lengthwise.

(e) The compound formed by the combination of haemoglobin and carbon dioxide gas.

Name the body structure concerned with the given functional activity:

(a) Prevents food from entering the trachea during swallowing.

(b) Transports oxygen to the body cells.

(c) Helps to increase the volume of the chest activity lengthwise.

(d) Combines with the oxygen in the lungs.

(e) Protects the lungs from mechanical injuries.

(f) Provides actual diffusion of respiratory gases in lungs.

Arrange the organs of the human respiratory system in a proper logical sequence:

Bronchi, Lungs, Larynx, Nose, Trachea, Pharynx.

What is the normal percentage composition of gases in inspired air and expired air respectively?