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24 Cards in this Set
- Front
- Back
Ectoderm |
most superficial layer , develops into nervous tissue and the intergumentary system |
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Mesoderm |
poorly organized middle layer , give rise to connective and most muscle tissues |
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Endoderm |
inner layer , develops into many different tissues including th linings of internal tubes of the body. |
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Epithelial tissue |
Covers exposed surfaces , lines internal passageways , form glands. function in protection, secretion, absorption. |
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connective tissue |
fills internal spaces , support other tissues , transport materials, store nutrients |
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muscle tissue |
generates forces to permit movement , specialized for contraction , skeletal muscle, heart muscle , and walls of hollow organs. |
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neural tissue |
Non Conductive support elements and conductive elements that help maintain communication. carries electrical signals from 1 part pf the body to another . |
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Epithelia |
cellularity composed of cells with little to no extracellular substance . Polarity ( apical and basal surface that is exposed and a basilar surface that is attached. |
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Basement membrane |
Used to attach the epithelium to the underlying connective tissue. consist |
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Basal lamina |
or lamina lucida consisting of glycoproteins secreted by the epithelial cells . Act as a barrier |
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reticular lamina |
reticular lamina produced and secreted by the underlying connective tissues. |
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Avascular |
has no direct blood supply but must rely on transport of materials across the basement membrane . |
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Regeneration |
has a very high capacity of mitosis that permits repair and regrowth. |
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tight junctions |
lateral membranes are zipped together end to end to create an impenetrable barrier ( Gi and upper respiratory tract) prevents passage of water and solutes. |
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Gap Junctions |
allow rapid , direct cell to cell passages created by transmembranous proteins that allow ions to pass. used for cell to cell transport in heart, smooth muscle. |
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Desmosomes |
mechanical couplings that prevent tissue separation. it is where strength and stretch are needed, heart , skin , cervix, allow bending and twisting. |
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dense areas |
plaques on the intracellular surface |
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intercellular cement |
proteoglycans |
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hemidesmosomes |
stabilizes the epithelial cell and anchors it to the underlying tissues . |
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repairing and replacing epithelial |
epithelia are replaced by division of germinative cells ( stem cells) near basal lamina tend to be cuboidal in shape. |
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simple epithelium |
single layer of cells in touch with the Basal membrane, |
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stratified epithelium |
at least two layers with only a single layer in touch with the BM |
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pseudostratified epithelium |
gives the appearance of being stratified yet all the cells are in touch with the BM . |
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squamous epithelia |
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