Question

Breathing is a physical process which includes certain stages. Choose the option which exhibits the stages involved in breathing.

• A.
• B.
• C.
• D.

Answer 1

The correct option is B

Breathing involves two stages -- ventilation and gaseous exchange. Ventilation is the movement of air in and out of the lungs and gaseous exchange is the absorption of oxygen from the lungs and release of carbon dioxide into the lungs . Breathing being a physical process does not involve energy generation or storage. Energy generation is the result of cellular respiration.