Which of the following occurs when oxygen transfer from the blood to the body's cells and tissues?

A. Tracheal bifurcation

B. External respiration

C. Mechanical respiration

D. Internal respiration

B. External respiration

Explanation:

Respiration means transport of oxygen to the cells within tissues, and the transport of carbon dioxide in the opposite direction.

Answer: Option B.

External respiration.

Explanation:

External respiration is also called breathing and it occurs in the lungs. It refer to a process where oxygen is inhaled and diffuse into the blood to body tissues and carbon dioxide is expelled out in the air.