What are the 3 main function of respiratory system?

The respiratory system is responsible for three main functions:

1. Gas exchange: The primary function of the respiratory system is to facilitate the exchange of oxygen and carbon dioxide between the body and the atmosphere. Oxygen is inhaled into the lungs, where it diffuses across the alveoli into the bloodstream. Carbon dioxide, a waste product of metabolism, diffuses from the bloodstream into the alveoli and is exhaled.

2. Regulation of blood pH: The respiratory system helps regulate the pH of blood by controlling the levels of carbon dioxide in the blood. Carbon dioxide is a weak acid, so an increase in its concentration can lead to acidosis, while a decrease in its concentration can lead to alkalosis. The respiratory system can adjust the rate and depth of breathing to maintain the optimal pH balance of the blood.

3. Voice production: The respiratory system is also involved in voice production. When air is exhaled through the larynx, it causes the vocal cords to vibrate, producing sound. The pitch and tone of the sound are controlled by the tension and length of the vocal cords, as well as the shape of the vocal tract.