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External respiration refers to the exchange of gases between the lungs and the blood, primarily occurring in the alveoli through diffusion, where oxygen is absorbed into the bloodstream and carbon dioxide is released. Internal respiration, on the other hand, is the exchange of gases between the blood and the body tissues, also occurring via diffusion, where oxygen is delivered to cells and carbon dioxide is collected for removal. Both processes rely on the concentration gradients of oxygen and carbon dioxide to facilitate gas movement.

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What is the difference between internal and external respiration?

External Respiration is the exchange of O2 and CO2 between the body and the environment. It involves moving air in and out of the lungs and the exchange of gases between the alveoli and the blood capillaries. The gases must also be exchanged between the blood capillaries and the cells of the body. This is called internal respiration. Some sources say this is the same as tissue respiration, but to me that means the chemical reactions which take place in our cells to release energy, the most usual of which is glucose + oxygen --> carbon dioxide and water.


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