eptithetical and skin.docx

Positioned side by side with the help of structures

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positioned side-by-side with the help of structures specialized in cell adhesion, such as desmosomes and interdigitations. This feature is related to the fact that these tissues are generally exposed to an exterior environment and, as a result, need more resistance and impermeability against the entrance of foreign materials into the body. Connective tissue has the opposite features, due to its filling function. It contains a large amount of interstitial material (the matrix) and has a relatively large space between cells. Select any question to share it on FB or Twitter Just select (or double-click) a question to share. Challenge your Facebook and Twitter friends. Cell Adhesion and the Vascularization of Epithelia
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6. What specialized structures help in the adhesion between cells? The structures responsible for the adhesion of epithelial cells are called cell junctions. The main cell junctions are interdigitations, desmosomes, zonula adherens (adherens junctions), tight junctions (zonula occludens) and gap junctions. Epithelial Tissue Review - Image Diversity: cell junctions 7. Is epithelium vascularized? How do nutrients and oxygen reach epithelium? Why is this feature an important evolutionary acquisition? Epithelium is not vascularized (capillaries do not directly reach its cells). It exchanges substances by diffusion with the connective tissue located under it. Since epithelium is not vascularized, the tiny skin injuries or scratches that happen all the time do not cause bleeding and do not expose the blood to contamination from foreign agents. This is an important protective strategy of evolution.
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