Overview of the Process of Respiration MCQ - Practice Questions with Answers

Respiration involves the following steps:

• Breathing or pulmonary ventilation by which atmospheric air is drawn in and CO2  rich alveolar air is released out. It is also called gaseous exchange by lungs.
• Diffusion of gases (O2 and CO2) across the alveolar membrane. This is called external respiration.
• Transport of gases by the blood.
• Diffusion of O2 and CO2 between blood and tissues. This is called internal respiration.
• The utilisation of O2 by the cells for catabolic reactions and resultant release of CO2. this is called cellular respiration.