Explain the 3 types of respiration.
1.) External Respiration- inhale and exhale; exchange O2 and CO2 with lungs, body, and outside environment, then diffusion between the alveoli of lungs and capillaries of blood.
2.)Internal Respiration- diffusion of gases between cells and the surrounding lymph.
3.) Cellular Respiration- use of oxygen to release energy stored in cells.
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