[RS] Q.3) What is respiration, Phages of respiration, types of respiration, rate of respiration.

Ans.

Respiration:
                   It is a physiological process which means the transport of O2 from the atmosphere to cell of the body for oxidation and elimination of CO2 and other volatile metabolic end products from the cell to atmosphere.

Phages of respiration:

• Inspiration (active process) - It means intake of air into lungs. It is about 2 seconds.
• Expiration (passive process) – It means output of air from lungs. It is about 3seconds.

Types of respiration:

• External respiration – Exchange of O2 and CO2 between the blood and lungs alveoli.
• Internal respiration – Utilization of O2 and production of CO2 by cells and gaseous exchanges  between the cells and their fluid medium.

Rate of Respiration:

•   Adult (avg.) → 12-18 breaths/min.