Respiration in the Human Body Relies on ____

Question

Respiration in the human body relies on ____.  
A) exocytosis and endocytosis
B) facilitated diffusion
C) osmosis
D) simple diffusion
E) active transport

Accepted Answer

Respiration in the human body relies on the exchange of gases (oxygen and carbon dioxide) between the lungs and the blood, and then between the blood and the body's cells. This exchange occurs through simple diffusion, where gases move down their concentration gradient from an area of higher concentration to an area of lower concentration, without the need for energy or transport proteins.