Respiration is important because it is the process by which living organisms obtain energy from food molecules such as glucose. This energy is necessary for various cellular functions, including growth, repair, and movement. Without respiration, the cells in the body would not have enough energy to carry out their functions, and the organism would not be able to survive. Respiration also plays a critical role in the exchange of gases between the body and the environment, as it enables the uptake of oxygen and the removal of carbon dioxide.