Question

Exchange of gases between the blood and the tissues of the body takes place by which of the following mechanism?

• A. External respiration
• B. Internal respiration
• C. Cellular respiration
• D. Counter-current exchange

Answer 1

The correct option is B

Internal respiration

Diffusion is the process by which exchange of gases takes place between blood and body tissues. Respiratory gas is transported to each and every cell by blood. Tiny capillaries provide the blood flow to even remote parts of the body tissue. Then the gases, oxygen from the blood to tissue fluid and carbon dioxide from tissue fluid to blood, diffuse. The diffusion takes the particular direction due to differences in the concentration of these gases.