The permeability of epithelial cells regulates the exchange of materials between the body and the external environment, as well as between different parts of the body. It helps maintain homeostasis by controlling the passage of substances such as nutrients, gases, and waste products.
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The permeability of epithelial cells regulates the selective passage of substances, facilitating essential functions like nutrient absorption, waste excretion, and fluid balance in organs such as the gastrointestinal tract and kidneys. Additionally, epithelial cells form protective barriers against pathogens and toxins, crucial for maintaining tissue integrity and defending the body against infections.