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A & P Lab # 4

A & P Lab book exercise 7

histology the study of tissues
tissue a group of similar cells working together to perform a specific function
four major categories of cells epithelial, connective, muscle, neural
free surface the exposed surface to the external environment or internal passageway
avascular do not contain blood vessels
basal lamina the membrane between the epithelium and the connective tissue layer, provides nutrients to the epithelium by diffusion
stem cells short lived cells that constantly produce new cells to replenish tissue
epithelia lining or covering tissues
simple epithelium single layer of cells, provides thin surface for exchange of materials like between the lungs and blood
stratified epithelium multiple layers of cells that protect against friction, prevent dehydration and keep microbes and chemicals from invading the body
transitional epithelium special kind of stratified epitheliume with cells of many shapes that permit the tissue to stretch and recoil
pseudostratified epithelium all the cells touch the basal lamina but grow to different heights
squamous irregularly shaped, flat and scalelike cells; unction either to protect, secrete or diffuse
cuboidal cubic and have a large nucleus; found in the tubules of the kidneys and in many glands and can secrete and absorb materials across the tubular/gladular wall
columnar taller than they are wide
goblet cells found in the small intestine and secrete mucus to coat and protect epithelia
simple squamous epithelium a thin tissue that is in a superficial preparation appears as a sheet of cells that look like ceramic floor tile; found in serous membranes, blood vessels and air sacs of lungs
simple cuboidal epithelium lines kidney tubules, thyroid and other glands and ducts;
simple columnar epithelium lines most of the digestive tract and uterine tubes and renal collecting duct; have more surface area and may caontain cilia
stratified squamous epithelium forms superficial region of the skin; manufacture keratin; dry surface due to keratin.Nonkeratinized cells line tongue, mouth esophagus, anus and vagina
stratified cuboidal epithelium uncommon, found in sweat glands
stratified columnar epithelium found in mammary glands, salivary-gland ducts and in small regions of the pharynyx, epiglottis, anus and urethra
pseudostratified columnar epithelium lines the naval cavity, the trachea, bronchi and parts of the male reproductive tract; contains stem cells and goblet cells
transitional epithelium lines organs such as, the urinary bladder and uterus, that must stretch and shrink, not all touch the basal lamina
Created by: kshaye17