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14 Cards in this Set
- Front
- Back
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What is epithelial tissue? |
A type of tissue that is used as a covering for organs and lining for organs on the inside. It is avascular (no blood vessels) and has many cells, nerve endings ( very sensitive), has a basement membrane(attachment layer) and a free surface, outside is exposed to the organ. |
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Where is epithelial tissue found? |
Epithelial tissue is found |
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How is epithelial tissue classified? |
My type of cells and number of layers. |
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What is the function of EP tissue? |
Protection from dehydration and bacteria, secretion of enzymes and hormones, mucous, reduces friction, cover body and organs and lines cavities. |
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What are the cell shapes in epithelial tissue? |
Squamous - thin flat Cuboidal- cube shaped Columnar- column Transitional- multiple |
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simple squamous ep |
one cell layer used in diffusion/osmosis, kidneys, lungs, capillaries mesothelium- lines cavities, pariteal and visceral layers endothelium- lines heart and blood vessels |
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simple cuboidal ep |
one cell layer cube shaped cells absorption and secretion kidneys, tubules, lens of eye, glands |
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simple columnar ep |
column shaped goblet cells- no cilia, secrete mucous in digestive and respiratory tract have microvilli ciliated- found in upper respiratory tract, clean lungs tissue absorbs and secretes |
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stratified squamous ep |
flat on top, cuboidal/columnar on bottom constant mitosis cells dehydrate from lack of blood as they move towards surface, die skin cells are keratinized = waterproof not in mouth, tongue, esophogus cells |
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stratified cuboidal ep |
rare- sweat glands, ducts, pharynx, epiglotis, protection |
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stratified columnar ep |
rare, mammary glans, urethra, protection and secretion |
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transitional ep |
looks cuboidal, top layers of cells are round to stretch, when stretched appear squamous, in stretch organs such as bladder |
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pseudo-stratified columnar ep |
all cells attach to basement, but appear to be stratified, but are simple. upper respiratory tract, contain cilia to remove dirt. also in reproductive tract to move the egg cell. |
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Glandular Epithelial |
Gland- a cell or cluster of cells that secrete substances into ducts or the blood Exocrine- secretes into the ducts ie sweat Endocrine- ductless secretes directly into the blood ie hormones |
