Biology

Phosphorus Cycle

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Phosphorus Cycle

Phosphorus Cycle Definition The phosphorus cycle is the process by which phosphorus moves through the lithosphere, hydrosphere, and biosphere. Phosphorus is essential for plant and animal growth, as well as the health of microbes inhabiting the soil, but is gradually depleted from the soil over time. The main biological function of phosphorus is that it … Read more

Internal Respiration

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Internal Respiration

Internal Respiration Definition During internal respiration, oxygen diffuses from the blood into the interstitial fluid and into the cells. The waste and carbon dioxide are also diffused from the cells to the blood in the other direction. Blood cells release oxygen when the oxygen concentration in capillaries of blood vessels is low, which is usually … Read more