Epithelial Tissue Cell Adhesion and Junctions Quiz
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Questions and Answers

Which type of junction allows epithelial cells to attach to and communicate with each other?

  • Tight junctions
  • Hemidesmosomes
  • Desmosomes (correct)
  • Gap junctions

Which type of epithelium is specialized for secretion and absorption?

  • Pseudostratified columnar epithelium
  • Simple columnar epithelium (correct)
  • Simple cuboidal epithelium
  • Stratified squamous epithelium

Which type of epithelium is best suited for areas subjected to mechanical stress?

  • Stratified squamous epithelium (correct)
  • Simple squamous epithelium
  • Stratified cuboidal epithelium
  • Transitional epithelium

Which type of junction forms a barrier to the passage of water and solutes between cells?

<p>Tight junctions (D)</p> Signup and view all the answers

Which type of epithelium is found in the alveoli of the lungs and facilitates diffusion of gases?

<p>Simple squamous epithelium (C)</p> Signup and view all the answers

Where is pseudostratified epithelium primarily found?

<p>Upper respiratory tract (D)</p> Signup and view all the answers

What is the composition of the basal lamina?

<p>Laminins, collagens, entactin/nidogen, and proteoglycans (C)</p> Signup and view all the answers

What is the function of microvilli?

<p>Increase surface area with a core of actin microfilaments (D)</p> Signup and view all the answers

Where are stereocilia found?

<p>Epididymis (D)</p> Signup and view all the answers

What is the main function of basolateral folds?

<p>Increase surface area in cells that transport fluid rapidly (A)</p> Signup and view all the answers

Where is simple squamous epithelium found?

<p>Blood vessels, kidney tubules, and respiratory spaces (D)</p> Signup and view all the answers

What is the function of stratified squamous epithelium?

<p>Functions as a barrier and is found in the skin, oral cavity, esophagus, and vagina (D)</p> Signup and view all the answers

Where is simple cuboidal epithelium found?

<p>Thyroid, kidney tubules, and ovary (A)</p> Signup and view all the answers

What characterizes epithelial tissue?

<p>Arranged as sheets or masses, with limited intercellular space and specific membrane proteins (C)</p> Signup and view all the answers

What is the classification of epithelium based on?

<p>Cell arrangement (simple or stratified) and cell shape (squamous, cuboidal, or columnar) (C)</p> Signup and view all the answers

What provides energy to the Na/K pump in the intestinal epithelium?

<p>Mitochondria (C)</p> Signup and view all the answers

Where are Gap Junctions found?

<p>Epithelia, smooth muscle, cardiac muscle, and nerves (C)</p> Signup and view all the answers

What is the function of Zonula Occludens (tight junction)?

<p>Seals the outer leaflets of adjoined plasma membranes, preventing free molecular movement (A)</p> Signup and view all the answers

Where are Hemidesmosomes located?

<p>Basal plasma membrane of the cell (B)</p> Signup and view all the answers

What do Focal Adhesions link to in the cell?

<p>Actin filaments (D)</p> Signup and view all the answers

Flashcards

Desmosomes function

Cell junctions that attach epithelial cells to each other, providing structural support.

Simple columnar epithelium function

Specialized for secretion and absorption, often found lining digestive tract.

Stratified squamous epithelium function

Provides a protective barrier in areas subject to mechanical stress.

Tight junctions function

Form a barrier to prevent leakage of water and solutes between cells.

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Simple squamous epithelium function

Facilitates diffusion of gases (e.g., in lungs), minimal thickness.

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Pseudostratified epithelium location

Found primarily in the upper respiratory tract.

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Basal lamina composition

Protein network (laminins, collagens, entactin/nidogen, proteoglycans) supporting epithelium.

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Microvilli function

Increase surface area for absorption, supported by actin microfilaments.

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Stereocilia location

Found in the epididymis.

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Basolateral folds function

Increase surface area for rapid fluid transport.

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Simple squamous epithelium location

Blood vessels, kidney tubules, respiratory surfaces.

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Stratified squamous epithelium function

Barrier function in skin, oral cavity, esophagus, vagina.

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Simple cuboidal epithelium location

Thyroid, kidney tubules, ovaries.

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Epithelial tissue characteristic

Sheets or masses of cells with minimal intercellular space, specific proteins.

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Epithelial classification

Based on cell arrangement (simple/stratified) and shape (squamous/cuboidal/columnar).

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Na/K pump energy source

Mitochondria provide energy for active transport.

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Gap junctions location

Epithelia, smooth muscle, cardiac muscle, nerves.

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Zonula Occludens (tight junction) function

Seals adjacent plasma membranes, prevents leakage.

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Hemidesmosomes location

Basal plasma membrane of the cell.

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Focal Adhesions link to

Link to actin filaments within the cell.

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Study Notes

Cell Adhesion and Junctions in Epithelial Tissue

  • Water in the intestine enters cells apically and leaves cells at the lateral surface, following sodium ions that are actively transported across the lateral plasma membrane
  • Mitochondria provide energy to the Na/K pump in the intestinal epithelium
  • The Junctional Complex in epithelial cells consists of Zonula Occludens (tight junction), Zonula Adherens, Macula Adherens (desmosome), and Gap Junctions
  • Zonula Occludens (tight junction) seals the outer leaflets of adjoined plasma membranes, preventing free molecular movement and diffusion of membrane proteins
  • Zonula Adherens (adhering junction) provides lateral adhesion between epithelial cells and is calcium-dependent
  • Fascia Adherens is a sheet-like junction found in the intercalated disc of cardiac muscle
  • Macula Adherens (desmosomes) form strong attachment structures in simple cuboidal or simple columnar epithelium, with an attachment plaque and intermediate filaments
  • Gap Junctions are found in epithelia, smooth muscle, cardiac muscle, and nerves, allowing communication and exchange of ions, regulatory molecules, and small metabolites
  • Hemidesmosomes, located on the basal plasma membrane of the cell, connect the basal plasma membrane of cells to the basal lamina in stratified squamous epithelium
  • TEM exhibits intracellular attachment plaques and transmembrane proteins integrins in hemidesmosomes
  • Focal Adhesions are dynamic attachments linking actin filaments to extracellular matrix proteins, playing a role in cell attachment and migration
  • The lecture provides additional reading resources on epithelial tissue and histology for further study

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Description

Test your knowledge of cell adhesion and junctions in epithelial tissue with this quiz. Learn about the different types of junctional complexes, their functions, and their roles in maintaining tissue integrity. Topics include tight junctions, adhering junctions, desmosomes, gap junctions, and focal adhesions.

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