Basal Lamina Components

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What is the primary function of microvilli in epithelial cells?

To facilitate the movement of substances

To provide structural support to the cell

To increase the cell's surface area (correct)

To regulate cell growth and division

What is the significance of the basement membrane in epithelial tissues?

It provides structural support to the epithelial cells

It facilitates the exchange of substances between the epithelium and connective tissue (correct)

It prevents the growth of new epithelial cells

It increases the permeability of the epithelial layer

What is a characteristic feature of epithelial tissues?

The presence of blood vessels

The avasularity of the tissue (correct)

The ability to regenerate quickly

The absence of cell junctions

What is the primary role of cell junctions in epithelial tissues?

To maintain tissue polarity (D) Signup and view all the answers

What is the term for the layer of connective tissue that underlies the epithelial layer?

Lamina propria (D) Signup and view all the answers

What is a key difference between epithelial and connective tissue?

The presence of blood vessels (D) Signup and view all the answers

What type of molecule is Entactin (Nidogen)?

Glycoprotein (C) Signup and view all the answers

What is the function of Occluding junctions?

To seal the cells together to prevent the flow of materials (A) Signup and view all the answers

What type of tissue is located under the basal lamina?

Connective tissue (A) Signup and view all the answers

What is the function of Anchoring or Adhesive junctions?

To attach cells to the basement membrane (D) Signup and view all the answers

What is the name of the layer that is visible with electron microscope or light microscope with PAS staining?

Reticular lamina (A) Signup and view all the answers

What type of molecule is Perlecan?

Proteoglycan (A) Signup and view all the answers

What type of protein is involved in the attachment of microvilli to the terminal web beneath the cell membrane?

Actin-binding proteins (C) Signup and view all the answers

What is the primary function of the lamina propria in epithelial tissues?

To support the epithelium and provide it with nutrition (A) Signup and view all the answers

What is the main characteristic of epithelial tissues in terms of regeneration?

They have abundant stem cells that can differentiate and repair damages (B) Signup and view all the answers

What is the primary function of microvilli in the small intestine and renal tubules?

To increase the surface area for absorption (A) Signup and view all the answers

What type of junction is characterized by the presence of connexins and allows for the passage of small molecules like cGMP and cAMP?

Gap junctions (B) Signup and view all the answers

What is the function of the basement membrane in epithelial tissues?

To attach the epithelium to the underlying connective tissue (C) Signup and view all the answers

What is the name of the layer of connective tissue that epithelial tissues rest on?

Lamina propria (C) Signup and view all the answers

What is the primary function of the apical surface of an epithelial cell?

To move substances bound to the epithelium (D) Signup and view all the answers

What is the characteristic of epithelial tissues in terms of polarity?

They have different surfaces, such as apical, basal, and lateral surfaces (C) Signup and view all the answers

What is the term for the thickened glycocalyx on the surface of microvilli?

Brush border (D) Signup and view all the answers

What is the thickness of the basal lamina, as observed with an electron microscope?

20-100 nm (A) Signup and view all the answers

What type of structure is characterized by a hexameric complex of connexins and has a diameter of 1.5 nm?

Connexon (C) Signup and view all the answers

What is the primary function of the basement membrane in epithelial tissues?

To anchor the epithelial cells to the underlying connective tissue (A) Signup and view all the answers

What is a consequence of the avasularity of epithelial tissues?

Epithelial cells receive nutrients through diffusion from the apical and basal surfaces (D) Signup and view all the answers

What is the term for the layer of connective tissue that underlies the epithelial layer and is separated from it by the basement membrane?

Lamina propria (B) Signup and view all the answers

What is a characteristic feature of epithelial tissues in terms of cell regeneration?

Epithelial cells have a high rate of cell regeneration (A) Signup and view all the answers

What is the term for the phenomenon where epithelial cells have different structures and functions at their apical and basal surfaces?

Tissue polarity (C) Signup and view all the answers

What is the term for the surface of an epithelial cell that faces the underlying connective tissue?

Basal surface (C) Signup and view all the answers

Which type of junction is responsible for preventing the passage of molecules through the paracellular space?

Tight Junctions (C) Signup and view all the answers

What is the main protein found in Tight Junctions?

Claudin (C) Signup and view all the answers

What is the function of the glycoprotein in the extracellular matrix of Zonula Adherens?

Joins catenin to the actin filaments (C) Signup and view all the answers

What is the characteristic feature of the interval between cells in Desmosomes?

20 nm-interval including cadherins (C) Signup and view all the answers

What is the location of Hemidesmosomes in the cell?

Basal surface of the cell (B) Signup and view all the answers

What type of filaments are joined by the proteins in the plaque of Desmosomes?

Keratin filaments (D) Signup and view all the answers

What is the shape of Desmosomes?

Both disk-shaped and spot-shaped (D) Signup and view all the answers

What is the function of the plaque proteins in Hemidesmosomes?

Joins keratin filaments to the plasma membrane (C) Signup and view all the answers

Which type of junction is responsible for cell-cell adhesion?

Zonula Adherens (A) Signup and view all the answers

What is the location of Zonula Occludens in epithelial cells?

Apical surface of the cell (C) Signup and view all the answers