BackEpithelial Tissue Study Guide
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Terms in this set (20)
Epithelial tissue is a sheet of cells that covers body surfaces or lines body cavities, forming protective barriers and involved in absorption, secretion, and sensation.
Cellularity, polarity, attachment to a basement membrane, avascularity, innervation, and high regeneration capacity.
Polarity refers to the presence of an apical surface exposed to the body exterior or cavity and a basal surface attached to the basement membrane.
A thin, fibrous extracellular matrix that anchors epithelial tissue to underlying connective tissue and provides structural support.
As simple (one layer), stratified (multiple layers), or pseudostratified (appears layered but all cells contact the basement membrane).
Squamous (flat), cuboidal (cube-shaped), or columnar (tall and column-like).
Allows rapid diffusion and filtration; found in lungs (alveoli) and blood vessel linings.
Found in areas subject to abrasion like skin and mouth; provides protection.
Involved in secretion and absorption; found in kidney tubules and glands.
Absorbs nutrients and secretes mucus; lines most of the digestive tract.
A single layer of cells of varying heights that appears stratified; often ciliated and involved in secretion and movement of mucus.
Stratified epithelium that can stretch; found in the urinary bladder.
Cilia are hair-like projections that move substances across the epithelial surface, such as mucus in the respiratory tract.
Microvilli increase surface area to enhance absorption, especially in the small intestine.
It lacks blood vessels and receives nutrients via diffusion from underlying connective tissue.
Through frequent mitosis of stem cells located near the basement membrane.
Tight junctions seal adjacent cells to prevent leakage of molecules between them.
Desmosomes are anchoring junctions that provide mechanical strength by linking cytoskeletons of adjacent cells.
Gap junctions allow direct communication and passage of ions and small molecules between adjacent cells.
Protection from physical and chemical damage, and selective permeability for absorption and secretion.