Question

What is the structure and function of the respiratory zone?

Answer 1

Transport of respiratory gases and air passage.

Explanation:

Respiratory system has two parts. First is respiratory passage. It simply carries air through system of tubes. Nose, nasal passage, trachea, tracheoles are respiratory passages.
Other is respiratory surface. alveoli has thin surface. These are encircled with blood capillaries. Respiratory gases can easily pass though alveolar surface. Exchange of oxygen and carbon dioxide takes place through respiratory surface. The respiratory surface should be moist.