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Questions and Answers
Which type of cell arrangement covers external surfaces and lines internal surfaces?
What determines the properties of each surface domain of a cell?
What is the composition of the underlying basal lamina?
Which type of intercellular junctions are present in epithelial cells?
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What is the function of the basal lamina in epithelial cells?
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What are the distinct surface domains of epithelial cells?
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Study Notes
Epithelial Cell Arrangement
- Epithelial cells form continuous sheets covering external surfaces and lining internal cavities, such as organs and blood vessels.
Surface Domain Properties
- The properties of each cell surface domain are determined by the specific function and types of proteins present in the membrane, influencing permeability and interaction with the environment.
Composition of Basal Lamina
- The basal lamina primarily consists of proteins, including collagen, laminins, and glycoproteins, which provide structural support and facilitates cell attachment.
Intercellular Junctions in Epithelial Cells
- Key types of intercellular junctions in epithelial cells include tight junctions, adherens junctions, desmosomes, and gap junctions, each serving to ensure cell adhesion and communication.
Function of Basal Lamina
- The basal lamina serves multiple functions: it anchors epithelial tissues to the underlying connective tissue, acts as a selective barrier for molecules, and provides a scaffold for tissue regeneration.
Distinct Surface Domains of Epithelial Cells
- Epithelial cells feature distinct surface domains: the apical (top) surface, which often faces the lumen or external environment; the basal (bottom) surface, which contacts the basal lamina; and lateral surfaces, which interact with adjacent epithelial cells.
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Description
Test your knowledge on cell characteristics such as arrangement, surface domains, intercellular space, and intercellular junctions in this quiz.
