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221- Flashcard

are half desmosomes that anchor cells to the basement membrane.

Hemidesmosomes

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222- Flashcard
  • are cell connection structures that form barriers and anchor cells to each other.

Tight junctions

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223- Flashcard
  • are found just below the tight junctions, and help tight junctions anchor epithelial cells to each other.

adhesion belts

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  • Materials that pass through an epithelial layer with tight junctions must pass through the cells, so those cells regulate what materials can cross.
  • Materials that pass through an epithelial layer with tight junctions must pass through the cells, so those cells regulate what materials can cross.
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225- Flashcard
  • are found in the lining of the intestines.

Tight junctions

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226- Flashcard
  • are small channels that allow small molecules and ions to pass from one epithelial cell to an adjacent one.

Gap junctions

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227- Flashcard

Most epithelial cells are connected to one another by

gap junctions

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228- Flashcard
  • are secretory organs that secrete substances onto a surface, into a cavity, or into the bloodstream.

Glands

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  •  are composed primarily of epithelium, with a supporting network of connective tissue.

Glands

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Glands with ducts are called

exocrine glands

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  • are ductless glands; they secrete their products (termed hormones) into the bloodstream.

endocrine glands

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  • is the tube that transports the secreted material to the free surface of the epithelium.

duct

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  • part of the that gland lies deeper in the epithelium and is composed of cells that produce the secreted material.

The secretory portion

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  • can be classified according to the structure of their ducts and secretory regions, and mode of secretion.

Multicellular exocrine glands

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  • are composed of only a single cell.

Unicellular glands

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  •  are multicellular and have a single, nonbranched duct.

Simple glands

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are multicellular and have several branched ducts.

Compound glands

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Glands with secretory regions shaped as tubules (small tubes) are called

tubular

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whereas those shaped in saclike structures are called

acinar or alveolar

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  • glands forming a straight tube with no branching of the secretory portion

Simple tubular

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