Question

External respiration is

• A. Respiration in skin cells
• B. Gaseous exchange between organism and external environment
• C. Gaseous exchange between cells and tissue fluid
• D. Both B and C

Answer 1

Answer: (B)

Gaseous exchange between organism and external environment

External respiration which is also known as breathing is a physical process that involves the exchange of oxygen and carbon di oxide between an organism and its environment. It is a simple process which happens by diffusion as the concentration of oxygen is higher in the environment and thus it diffuses inside and concentration of carbon di oxide being higher in the cell is diffused to the outside. Thus, the correct answer is option B.