Question

Why respiration both intracellular and extracellular

Answer 1

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Cellular respiration is an intracellular process in which glucose (C6H12O6) is oxidized and the energy is used to make ATP (adenosine triphosphate)☺. ATP is a high energy molecule which organisms use to drive energy-requiring processes such as biosynthesis, transport, growth, and movement.

External respiration, commonly known as breathing, is the exchange of oxygen and carbon dioxide between an animal and its environment. Most animals use specialized organs or organ systems, such as lungs, trachea, or gills, for external respiration.