Question

When oxygen diffuses into the blood and carbon dioxide diffuses into the alveolar air is called as

• A. Internal respiration
• B. Anaerobic respiration
• C. External respiration
• D. None of the above

Answer 1

Answer: (C)

External respiration

There are two forms of respiration, internal and external respiration. External respiration refers to gas exchange across the respiratory membrane in the lungs. Gas exchange takes place between the alveoli and the blood in which there is diffusion of the oxygen from the alveoli to the blood and carbon dioxide from the blood to the alveoli. Internal respiration refers to gas exchange between the capillaries and the cells of metabolising tissues.

Thus, the correct answer is option C.