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Flashcards in Epithelum Deck (32):
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Epitheal tissue

Includes the surface of your skin

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Epithelia

Layers of cells that cover internal or external surfaces

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Glands

Are structures that produce fluid secretion; they are ethier attached to or deprived from epithelia

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Cellularity

Composed mostly of cells bound closely together by interconnections known as cell junctions

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Polarity

Uneven distribution of membrane functions and organelles between the exposed

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Attachement

The base of an epithelium is bound to a thin basal lamina.

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Avascularity

Do not contain blood vessels

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Regeneration

Epithelial cells are damaged or lost are continuously replaced

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Functions of epitheal tissue

Provide physical protection
Control permeability
Provide sensation
Produce specialized secretions

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Glandular epithelium

Most or all of the epi cells produce secretions which are ethier discarded onto the surface of the epi to provide physical protection or released into the surrounding interstitial fluid and blood to act as chemical messengers

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Apical surface

The cell is exposed to an internal or external environment

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Basolateral

Includes both the base, where the cell attaches to underlying epi cells and on the sides

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Ciliated epi

Contains cilia

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Cell adhesion molecules

Large areas of opposing cell membranes are interconnected by transmembrane proteins

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Intercellular cement

Thin layer of proteglycans that contain polysaccharide derivatives

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Hyaluronan

Polysaccharide derivatives known as Glycosaminoglycans

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Cell junctions

Specialized areas of cell membrane that attach a cell to another cell or to extra cellular materials.

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Tight junctions

Lipid portions of the two cell membranes are tightly bound together by interlocking membrane proteins

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Lumen

When the epi lines a tube the apical surface is exposed to the space inside the tube, a passageway

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Gap junction

Two cells are held together by interlocking membrane proteins called connexons

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Desmosome

CAMs and proteglycans link the opposing cell membranes

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Lamina lucida

Layer closet to the epi

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Lamina densa

Deeper layer of the basal lamina

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Endocrine glands

Release their secretion into the interstitial fluid

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Exocrine glands q

Release their secretions into passageways called ducts that open onto the epithelial surface

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Endocrine ex

Thyroid gland and pituitary gland

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Melocrine secretion

The product is released from secretory vesicles by exocytosis

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Apocrine secretion

Involves the loss of cytoplasm

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Holocrine

Destroys the gland cell

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Serous glands

Decrease a watery solution that contains enzymes. The Paramus salivary glands are serous glands

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Mucous glands

Secrete mucins that hydrate to form mucus

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Mixed exocrine glands

Contains more than one type of gland cell and may produce two differ t exocrine secretions, one serous and one mucous .