BackAnatomy & Physiology: Tissue Level of Organization
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Terms in this set (20)
A tissue is a group of specialized cells and cell products that perform one or more specific functions.
Epithelial, connective, muscle, and nervous tissues.
Covers exposed surfaces, lines internal passageways, and forms glands.
Fills internal spaces, provides structural support, transports materials, and stores energy.
Specialized for contraction to produce movement.
Propagates electrical impulses and carries information throughout the body.
Polarity, cellularity, attachment to basement membrane, avascularity, and regeneration.
Increase surface area for absorption and secretion, especially in digestive tract.
Motile cilia move fluids or secretions over epithelial surfaces, e.g., mucus in respiratory tract.
Gap junctions, tight junctions, and desmosomes.
Hold cells together via connexons and allow small molecules and ions to pass between cells.
Seal cells together to prevent water and solutes from passing between cells.
Cell adhesion structures that link plasma membranes and connect to the cytoskeleton for stability.
Resembles half a desmosome; attaches epithelial cells to the basement membrane.
Squamous (flat), cuboidal (box-like), and columnar (tall and slender).
Simple (one layer) or stratified (multiple layers).
Found in protected regions like alveoli; functions in absorption and diffusion.
Keratinized has tough, water-resistant layers (e.g., skin); nonkeratinized resists abrasion but must stay moist (e.g., mouth lining).
A stratified epithelium that changes shape from cuboidal to squamous when stretched; found in urinary bladder.
Appears layered but all cells contact the basement membrane; often ciliated and found in respiratory tract.