Because epithelial tissue forms a protective barrier, anything entering or leaving the body must cross it, playing a crucial role in regulating exchanges with the external environment and within the body.
Why must anything entering or leaving the body cross at least one layer of epithelium?
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Anything entering or leaving the body must cross at least one layer of epithelium because epithelial tissue forms a protective barrier that lines all body surfaces and cavities. This barrier regulates the exchange of substances, ensuring that essential nutrients are absorbed while harmful substances are kept out.