Epithelial Tissues Flashcards Preview

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Flashcards in Epithelial Tissues Deck (52):
1

Layers of cells covering internal or external surfaces

Epithelia

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Structures that produce secretions

Glands

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Characteristics of Epithelia

1.Cellularity (cell junctions)
2.Polarity (apical and basal surfaces)
3.Attachment (basement membrane of basal lamina)
4.Avascularity
5. Regeneration

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Cells arranged in continuous sheets,in either single or multiple layers

Polarity (apical and basal surfaces)

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Functions of epithelial tissue

1. Provide physical protection
2. Control permeability
3. Provide sensation
4. Produce specialized secretions (glandular epithelium)

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Specializations of epithelial cells

1. Move fluids over the epithelium
2. Move fluids through the epithelium
3. Produce secretions (protection and messengers)

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protection

move fluids over the epithelium

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permeability

move fluids through the epithelium

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Protection and messengers

produce secretions

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Move fluid

Cilia or ciliated epithelium

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Increase absorption or secretion

Microvilli

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Polarity surfaces can be _________ or _________

apical or basolateral

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3 characteristics that maintain the integrity of the epithelia

1. Intracellular connections
2. Attachment to the basement membrane
3. Epithelial maintenance and repair

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Form bonds with other cells or extracellular material

Cell junctions

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Kinds of cell junctions

1. Tight junctions
2. Gap junctions
3. Desmosomes

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Cell junctions are ________ _________

intracellular connections

17

Intracellular connections' support and communication are done by:

1. CAMS (cell adhesion molecules)
-Transmembrane proteins
2. Intercellular cement
-Proteoglycans
3. Hyaluronan (hyaluronic acid)
-Glycosaminoglycans

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Proteoglycans are an example of intercellular connections that give support and communication via

intercellular cement

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Glycosaminoglycans are an example of intercellular connections that offer support and communication via _________

Hyaluronan (hyaluronic acid)

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-Between two plasma membranes
-Adhesion belt attaches to terminal web
- Prevents passage of water and solutes
-Isolates wastes in the lumen

Tight junctions

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Attaches to terminal web (in tight junctions)

Adhesion belt

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Tight junctions isolates wastes in the ________

Lumen

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Prevents passage of water and solutes

Tight junctions

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-CAMS, dense areas, and intercellular cement
-Spot desmosomes
-Hemidesmosomes

Desmosomes

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Tie cells together
Allow bending and twisting

Spot desmosomes

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Attach cells to the basement membrane

Hemidesmosomes

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-Allow rapid communication
-Are held together by channel proteins (junctional proteins, connexons)
-Allow ions to pass
-Coordinate contractions in heart muscle

Gap junctions

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Gap junctions are held together by channel proteins called _______ ________, _______

junctional proteins, connexons

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Allow ions to pass

Gap junctions

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Coordinate contractions in heart muscle

Gap junctions

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Allow rapid communication

Gap junctions

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Attachment to the Basement Membrane via a clear layer (lamina lucida) has what characteristics?

-Thin layer
-Secreted by epithelia
-Barrier to proteins

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Attachment to the basement membrane via the dense layer (lamina densa)

-Thick fibers
-Produced by connective tissue
Strength and filtration

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Dense layer is also known as

Lamina densa

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Lamina lucida is also known as

Clear layer

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Dense layer is also known as

Lamina densa

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Clear layer is also known as

Lamina Lucida

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Epithelium is singular or plural?

Singular

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Epithelia is singular or plural?

Plural

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Epithelia can be classified based on two things. What are these?

Shape and layers

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Based on shape, epithelia can be what three things?

1. Squamous epithelia
2. Cuboidal epithelia
3. Columnar epithelia

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Thin and flat

Squamous epithelia

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Square shaped

Cuboidal epithelia

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Tall, slender rectangles

Columnar epithelia

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Single layer of cells

Simple epithelium

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Several layers of cells

Stratified epithelium

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Simple epithelium and stratified epithilium are classified based on _______

Layers

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Squamous epithelia, cuboidal epithelia, and columnar epithelia are a classified based on _______

shape

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Epithelial maintenance and repair:

Epithelia are replaced by division of ________ _______ and happens ________ basement membrane

germinative cells (stem cells), near basement membrane

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Epithelium in charge of absorption and diffusion

Simple squamous epithelium

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Epithelium that lines body cavities

Mesothelium

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Epithelium that lines heart and blood vessels

Endothelium