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Anp Ch 4 Part A

Chapter 4 part A

TermDefinition
Tissue Groups of cells similar in structure that preform common or related function.
Histology Study of Tissues
Tissue types Epithelial, connective, muscle and nervous
Nervous Tissues Internal Communication. Brain, Spinal cord and Nerves
Connective Tissues Supports, protects and binds other tissues together. Bones, Tendons and Fat
Muscle Tissues Contracts to cause movement. Heart, walls of organs and muscles around bones
Epithelial Tissues Forms boundaries between different environments, protects, secrets, absorbs, and filters. Skin surface and lining of digestive tract.
Fixed tissue is preserved with solvent
Sectioned cut into slices thin enough to transmit light or electrons
Stained to enhance contrast
Functions of Epithelial Tissue protection, absorption, filtration, excretion, secretion and sensory reception.
Forms of Epithelial Tissue Covering and lining and Glandular
Covering and Lining Epithelia on external and internal surfaces ex: skin
Glandular Epithelia Secretory tissue in glands ex: salivary glands
Characteristics of Epithelial tissues Polarity, Specialized contacts, supported by connective tissues, avascular and Regeneration.
Polarity Has a top and bottom Apical Surface and Basal Surface
Apical Surface upper free side is exposed to surface or cavity
Basal Surface lower attached side faces inwards toward body
Specialized Contacts need to fit closley together like sheets.
Connective Tissue Support Reticular Lamina and Basement Membrane
Reticular Lamina Deep to basal lamina and consist of network of collagen fibers
Basement Membrane Made up of basal and reticular lamina
Metastasis spread of cancer
Avascular no blood vessels are found in epithelial tissue
Regeneration Epithelial cells have high regeneration capacities.
Simple Epithelia are single layer thick
Stratified Epithelia are two or more layers thick and involve protection.
Squamous flattened and scale like. squished flat top
Cuboldal Box like, cube
Columnar Tall, column like
Simple Squamous Epithelium 1 layer, found in kidney and lungs.
Endothelium Lining of lymphatic vessels, blood vessels and heart.
Mesothelium Serous membranes in the ventral body cavity.
Simple Cuboidal Epithelium Involved in secretion and absorption. Forms walls of smallest ducts of glands. Squishy middle.
Simple Columnar Epithelium Tall, closely packed cells. found in the digestive tract and gallbladder,
Pseudostratified Columnar Epithelium Vary in height and appear to be multi layered and stratified. Many cells are Ciliated. Mostly in upper respiratory tract.
Stratified Epithelial Tissues 2 or more layers of cells. External skin. Mucus membrane mouth to anus and vagina
Stratified Squamous Epithelium Most widespread of stratified epithelia. High wear and tear. Keratinized cells found in skin.
Stratified Cuboidal Epithelium Quite rare. Sweat and mammary glands
Stratified Columnar Epithelium Also very limited distribution in body.
Transitional Epithelium Forms lining of hollow nary organs. Bladder ureters and urethra. Sun flower looking
Gland one or more cells that makes and secretes and aqueous fluid called secretion.
Endocrine Glands Internally secreting, Ductless glands, secrete hormones
Exocrine Glands Externally Secreting. Secretions are released on to body surfaces such as skin. Have ducts.
Unicellular Exocrine Glands Found in epithelial linings of intestinal and respiratory tracts. Mucous cells and Goblet cells.
Multi-cellular Exocrine Glands are composed of a duct and secretory unit. Sweat and oil glands.
Tubular Gland secretory cells from a duct
Aveolar glands secretory cells from sacs.
Merocrine watery secretions like sweat and pancreas
Holocrine Dumps cell out and thicker like sebaceous oil glands
Apocrine glands activated during puberty. found in auxiliary and groin.
Created by: Jaytee07