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9 Cards in this Set
- Front
- Back
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epithelial tissue
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covers the body surfaces, lines its cavities, and forms the major portion of many human glands
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muscle tissue
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contracts to provide body movement or movement of things in or through the body
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nerve tissue
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conducts electrical impulses between all parts of the body and between the external environment and the body
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desmosomes
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a submicroscopic space separating the opposing cell membranes containing keratin filaments anchoring the two cells
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three types of junctions in human tissues
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tight junction
adhering junction gap junction |
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tight junctions
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Characteristic Specializations in cell membranes:
belts of protein that isolate parts of plasma membrane Width of intercellular space: intercellular space disappears when the two adjacent membranes lie adjacent Function: form a barrier prohibiting movement of substances between cells |
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adhering junctions
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Characteristic Specializations in cell membranes:
buttonlike welds joining opposing cell membranes Width of intercellular space: normal size 24nm Function: holds cells tightly together |
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gap junctions
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Characteristic Specializations in cell membranes:
Channels or pores through the two cell membranes and across the intercellular space Width of intercellular space: intercellular space greatly narrowed to 2 nm Function: provide for electrical communication between cells and for flow of ions and small molecules between cells |
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types of epithelial tissue
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simple squamous
simple cuboidal simple columnar pseudostratified squamous stratified squamous stratified cuboidal stratified columnar transitional |
