Term
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Definition
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Term
| What are the four basic types of tissues? |
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Definition
| Epithelial, connective, muscle, nervous |
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Term
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Definition
| Embryonic tissues that give rise to all tissues and organs of the body |
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Term
| What are the three primary germ layers? |
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Definition
| Ectoderm, mesoderm, and endoderm. |
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Term
| What germ layers give rise to epithelial tissue? |
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Definition
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Term
| Which germ layer gives rise to connective tissues and most muscle tissues? |
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Definition
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Term
| Which germ layer gives rise to nervous tissue and the epidermis of skin? |
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Definition
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Term
| where are most cell junctions found? |
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Definition
| Mostly in epithelial tissues and some muscle and nerve tissue. |
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Term
| What are tight cell junctions? |
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Definition
| Web-like strands of transmembrane proteins that fuse the outer surfaces of adjacent plasma membrane together. Looks like a line of spot welds. |
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Term
| Where are tight junctions found? |
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Definition
Often found in connecting cells lining the surface of an organ or body cavity
Ex: cells of epithelial tissues that line the stomach, intestines, urinary bladder, etc.
They passage of substances between cells. Prevents leakage. |
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Term
| What are adherens junctions? |
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Definition
Cells which contain plaque.
A dense layer of proteins on the inside of the plasma membrane.
Attaches the cytoskeleton proteins (microfilaments) and membrane proteins. Also contain transmembrane glycoproteins (cadherins) connecting to adjacent cells.
Very strong junctions that help cells resist separation. |
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Term
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Definition
Also contain plaque and transmembrane glycoproteins (cadherins).
The cadherins extend into the intercellular space between adjacent membranes and attach cells to one another. intermediate filaments made of keratin extend from desmosome on one side of the cell to desmosomes on the opposite end of the cell. This gives tensile strength to cells and tissues.
Common among epidermis and cardiac cells. Prevents epithelial cells from separating under tension.
Prevent cardiac muscles from pulling apart during contraction. |
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Term
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Definition
| A variation of desmosomes. Look like half of a desmosome. Connect cells to extracellular material like basement membrane. Have transmembrane proteins called integrins. |
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Term
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Definition
The outer layers of cell coverage but leave intercellular gaps to permit electrical or chemical signals to pass between cells.
Membrane proteins called connexins form fluid filled tunnels called connexons (connect neighboring cells, allot ions and small ions to diffuse from one cell to another, allow cells to communicate eith each other. Allow nerve or muscle impulses to spread rapidly among cells |
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Term
| What are the general locations of epithelial tissues? |
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Definition
| Covers body surfaces, lines hollow organs, body cavities, and ducts, also forms glands. |
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