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Definition
| A, cells are the building blocks off all plants and animals. B, they are produced by division of pre-existing cells. C, they are the smallest structural units that preform vital functions. |
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Definition
| cytoskeletal proteins that contract and are found in cilia and the mitotic apparati; also used in transporting materials from one location in the cell to another. |
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Definition
| cytoskeletal proteins that contract and are found in all types of muscle cells (thick and thin fillaments), within microvilli, and used in cytokinesis. |
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| Plasma membrane (plasmelemma) |
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Definition
| phospholipid bilayer that is in constant a constant state of osmotic equilibrium because the plasmelemma is selectively permeable. |
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Definition
| Found on apical surfaces of epithilial cells that line a lumen (cavity of a tube). Found on cells that are used for absorbtion or secretion, thus increasing apical surface. Composed of cytosol and microfillaments surrounded by plasmellema. Found lining the small intestines and some kidney cells. |
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Definition
| Found on apical surfaces that line a lumen (cavity of a tube). Found on cells that must move materials across their surfaces (mucus, gametes). Composed of a 9+2 array of microtubules covered by plasmellema. Found lining the respiratory airways, some reproductive ducts. |
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Term
| Tight junctions (occluding junction) |
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Definition
| Not a strong junction but one that keeps molecules from passing between adjacent cells. The cells are attached at "kiss sites" at apical surfaces of epithelial cells that line the digestive tract. Also found on the epidermis of the skin. At the kiss site, the plasma membranes are joined together by interlocking proteins. |
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| Gap junctions (communicationg junctions) |
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Definition
| Exhibited as a protein channel (conexon) that spans 2 adjacent cell. Used as the most rapid means of communication between 2 cells which move electrical ions (electrolytes) between cells through the gab junction. Very important in cardiac muscles, smooth muscles, and some nervous tissue. |
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Definition
| strongest of the attachments. Protein plates are found on the ICF side of 2 adjacent cellsmembranes and protein filaments will span the intercellular space, holding the 2 cells together (although not tightly). Important in tissues that are subject to stretching (cardiac, epidermis of skin, urinary bladder, uterus). |
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