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Unit 4 Vocabulary

Epithelial Tissue The tissue that is found throughout the body, covering internal and external surfaces. It protects underlying structures and acts as a barrier. It allows substances to diffuse through.
Muscle Tissue It contracts and shortens to enable movement. Muscle cells = muscle fibers.
Nervous Tissue Coordinates and controls body activity. (Brain, Spinal cord and nerves)
Connective Tissue An extracellular matrix that consists of protein fibers, ground substance, non fibrous protein and fluid. It is the most abundant type of tissue in the body.
Simple Epithelial Single layer of cells
Stratified Epithelial More than one layer of cells
Cuboidal Epithelial Shape of cell is CUBE-LIKE
Columnar Epithelial Shape of cell is TALL AND THIN
Pseudostratified Epithelial A type of epithelium that is a single layer of cells, but has its nuclei positioned in a manner suggestive of stratified epithelia.
Squamous Epithelial Shape of cell is FLAT
Transitional Epithelial A type of tissue consisting of multiple layers of epithelial cells which can contract and expand.
Apical Surface Layer of epithelial cells that is not in contact with other cells.
Basil Surface Attaches epithelial cells to underlying tissues composed of carbohydrates and proteins.
Basement Membrane A membrane of protein fibers separating an epithelium from underlying tissue.
Tight Junctions Bind adjacent cells to form permeability barriers; completely surround each cell; found in intestines and most simple epithelia.
Gap Junctions Small channels that allow small molecules and ions to pass from adjacent cells. (Most epithelial cells are connected this way)
Desmosomes Mechanical links that bind cells together; found where cells are subjected to stress (skin, stratified squamous)
Extracellular Matrix Extracellular materials that consist of protein fibers and ground substance. (Connective Tissue)
Collagen Protein fibers that are flexible, but resist stretching.
Reticular Protein fibers that are fine, short, collagen fibers that branch to form a network.
Elastic Fibers Protein fibers that after have been stretched, they have the ability to return to original shape.
Ground Substance Non Fibrous protein
Functions of Connective Tissue (7) +Join together tissues of the body(tendons and ligaments)+Support (trachea, bones)+Protect underlying organs (skull)+Transport (blood)+Nutritive Functions (blood)+Immune Function (lymphocytes/white blood cells)+Storage sites & insulation (Fat tissue)+
Connective Tissue Proper Extracellular matrix composed mostly of collagen fibers.
Loose Connective Tissue Fills spaces between organs and holds them in place.
Supporting Connective Tissue Contains a matrix with protein fibers; filled with lipids to store energy; protects and insulates the body.
Created by: BrittD2015