Epithelial Tissue Quiz

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Questions and Answers

Which of the following is NOT one of the four basic tissues?

  • Epithelium (correct)
  • Nervous
  • Muscular
  • Connective

What is the main function of epithelial tissue?

  • Transporting oxygen
  • Covering and lining surfaces (correct)
  • Producing hormones
  • Providing support

What does it mean when it is stated that epithelium is avascular tissue?

  • It has blood vessels only in certain areas
  • It has a lot of blood vessels
  • It has specialized blood vessels
  • It has no blood vessels (correct)

Which type of cell arrangement is found in glands?

<p>Placed very close to each other (B)</p> Signup and view all the answers

What are the three distinct surface domains of polarized cells?

<p>Apical, basal, and lateral (A)</p> Signup and view all the answers

What is a characteristic of cell junctions in epithelial tissue?

<p>They are present in epithelial cells (A)</p> Signup and view all the answers

Which type of cell arrangement is characteristic of epithelial tissue in glands?

<p>Placed very close to each other (C)</p> Signup and view all the answers

What is the main function of intercellular junctions in epithelial tissue?

<p>To connect adjacent cells (B)</p> Signup and view all the answers

What are the distinct surface domains of polarized cells in epithelial tissue?

<p>Apical, basal, and lateral domains (D)</p> Signup and view all the answers

Which of the following is a characteristic of cell arrangements in epithelial tissue?

<p>Cells are arranged in sheets (A)</p> Signup and view all the answers

What is the function of intercellular junctions in epithelial tissue?

<p>To allow for communication between cells (C)</p> Signup and view all the answers

Which of the following is a characteristic of polarized cells in epithelial tissue?

<p>They have three distinct surface domains (D)</p> Signup and view all the answers

Which type of cell arrangement is characteristic of epithelial tissue in glands?

<p>Or as masses (A)</p> Signup and view all the answers

Which one of these is a characteristic of cell arrangements in epithelial tissue?

<p>Arranged as sheets (C)</p> Signup and view all the answers

What are the distinct surface domains of polarized cells in epithelial tissue?

<p>Apical, basal, and lateral domains (B)</p> Signup and view all the answers

Which of the following is NOT one of the four basic types of animal tissue?

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

What is the outermost layer of the skin called?

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

What is the function of compound epithelium?

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

What is the classification of epithelial tissues based on?

<p>The shape and function of the cells (B)</p> Signup and view all the answers

What is the function of stratified epithelium?

<p>To provide mechanical or chemical protection (A)</p> Signup and view all the answers

Which type of epithelium lines the inside of the mouth and the esophagus?

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

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

<p>To provide mechanical support for the tissue (B)</p> Signup and view all the answers

What is the function of adherens junctions in cell junctions?

<p>To attach both cells' microfilaments (D)</p> Signup and view all the answers

Which type of cell junction attaches the epithelial cell to the basement membrane?

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

What are gap junctions made up of?

<p>Proteins called connexins (B)</p> Signup and view all the answers

Which germ layers do epithelial tissues derive from?

<p>All of the above (D)</p> Signup and view all the answers

Which type of cell junction attaches the epithelial cell to the basement membrane?

<p>Hemidesmosomes (B)</p> Signup and view all the answers

Which proteins make up gap junctions?

<p>Connexins (B)</p> Signup and view all the answers

Which germ layers give rise to epithelial tissues?

<p>All three germ layers (D)</p> Signup and view all the answers

What is the major difference between endocrine glands and exocrine glands?

<p>Endocrine glands secrete into a duct, while exocrine glands secrete into the extracellular space (C)</p> Signup and view all the answers

Flashcards

Four Basic Tissues

Connective, Muscle, and Nervous tissues, NOT Blood, are the four basic tissue types.

Epithelial Tissue Function

Epithelial tissue forms linings of organs, glands, and body surfaces.

Avascular Tissue

Epithelial tissue lacks a direct blood supply.

Cell Arrangement in Glands

Epithelial cells in glands are arranged in clusters.

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Cell Arrangement in Epithelium

Epithelial cells are closely packed in layers.

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Polarized Cell Surfaces

Apical, lateral, and basal surfaces.

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Epithelial Cell Junctions

Intercellular, adherens, and gap junctions connect epithelial cells.

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Intercellular Junction Function

Hold cells together, maintain tissue integrity, and facilitate cell-cell communication.

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Gap Junctions

Allow direct cell-cell communication.

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Gap Junction Composition

Connexins.

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Adherens Junctions

Attach epithelial cells to the basement membrane.

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Epithelial Classification

Based on number of layers and cell shape.

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Simple Epithelium

Single layer of cells.

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Stratified Epithelium

Multiple layers of cells.

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Compound Epithelium

Multiple layers of cells with different shapes.

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Epithelium's Skin Layer

Epidermis.

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Mouth/Esophagus Lining

Stratified squamous epithelium.

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Basement Membrane

Separates epithelial tissue from underlying connective tissue.

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Compound Epithelium Function

Protects underlying tissues.

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Stratified Epithelium Function

Protects and allows for stretching.

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Exocrine Glands

Secrete substances through ducts to the body's surface.

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Endocrine Glands

Secrete hormones directly into the bloodstream.

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Gap Junction Function

Direct cell-cell communication.

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Gap Junction Proteins

Connexins.

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Epithelial Germ Layers

Ectoderm and endoderm.

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Simple Squamous Epithelium

Flat cells in a single layer.

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Simple Cuboidal Epithelium

Cube-shaped cells in a single layer.

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Simple Columnar Epithelium

Tall, column-shaped cells in a single layer.

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Stratified Squamous Epithelium

Multiple layers of flattened cells.

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Stratified Cuboidal Epithelium

Multiple layers where surface cells are cube-shaped.

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Study Notes

Epithelial Tissue

  • NOT one of the four basic tissues: Connective tissue, Muscle tissue, Nervous tissue, and NOT Blood
  • Main function of epithelial tissue: forms the lining of organs, glands, and other body surfaces
  • Epithelium is avascular tissue: means it does not have a direct blood supply

Cell Arrangement in Epithelial Tissue

  • In glands: cells are arranged in clusters or acini
  • In epithelial tissue: cells are closely packed and arranged in one or multiple layers
  • In polarized cells: three distinct surface domains: apical, lateral, and basal surfaces

Cell Junctions in Epithelial Tissue

  • Characteristic: intercellular junctions, adherens junctions, and gap junctions
  • Intercellular junctions: hold cells together, maintain tissue integrity, and facilitate cell-cell communication
  • Gap junctions: made up of connexins, allow for direct cell-cell communication
  • Adherens junctions: attach epithelial cells to the basement membrane

Epithelial Tissue Classification

  • Based on the number of layers and the shape of cells
  • Simple epithelium: single layer of flat, cube-shaped, or columnar cells
  • Stratified epithelium: multiple layers of cells
  • Compound epithelium: multiple layers of cells with different shapes

Epithelial Tissue Functions

  • Forms the outermost layer of the skin: epidermis
  • Lines the inside of the mouth and the esophagus: stratified squamous epithelium
  • Basement membrane: separates epithelial tissue from underlying connective tissue
  • Function of compound epithelium: protects underlying tissues
  • Function of stratified epithelium: protects underlying tissues and allows for stretching

Glands and Gap Junctions

  • Exocrine glands: secrete substances through ducts to the surface of the body
  • Endocrine glands: secrete hormones directly into the bloodstream
  • Gap junctions: allow for direct cell-cell communication, composed of connexins

Germ Layers and Epithelial Tissues

  • Epithelial tissues derive from ectoderm and endoderm germ layers

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