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A & P Lab # 4
A & P Lab book exercise 7
| Question | Answer |
|---|---|
| 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
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