Block 1 Mini 1 Epithelia

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  • 1/11 Questions

    Which of the following cell types is found lining blood vessels of the skin?

    • Stratified cuboidal epithelium
    • Loose connective tissue
    • Transitional epithelium
    • Ciliated pseudostratified columnar
    • Simple squamous epithelium
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Block 1 Mini 1 Epithelia - Quiz
About This Quiz

This quiz, titled 'Block 1 Mini 1 Epithelia', assesses knowledge on epithelial tissues, focusing on their structures, types, and functions. It covers topics such as plasma cells, basal folds, epithelial polarity, and the basement membrane, essential for students in biology and medical studies.

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  • 2. 

    Which of the following junctions allows the cell to bind to the basal lamina?

    • Zonula occludens

    • Zonula adherens

    • Hemidesmosomes

    • Macula adherens

    • Gap Junction

    Correct Answer
    A. Hemidesmosomes
    Explanation
    Hemidesmosomes are junctions that allow cells to bind to the basal lamina. They are specialized cell adhesion structures found in epithelial tissues. Hemidesmosomes anchor the basal surface of epithelial cells to the underlying extracellular matrix, specifically the basal lamina. This anchoring is important for maintaining the structural integrity and stability of the epithelial tissue.

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  • 3. 

    Which of the following is found primarily in the lamina densa of the basement membrane?

    • Entactin

    • Type IV collagen

    • Microfibrils

    • Laminin

    • Reticular fibers

    Correct Answer
    A. Type IV collagen
    Explanation
    Type IV collagen is found primarily in the lamina densa of the basement membrane. The basement membrane is a thin, specialized extracellular matrix that separates epithelial and endothelial cells from underlying connective tissue. Type IV collagen is a major component of the basement membrane and provides structural support and stability to the membrane. It forms a mesh-like network in the lamina densa, contributing to the barrier function of the basement membrane and regulating the passage of molecules between the epithelial/endothelial cells and the underlying tissue.

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  • 4. 

    Which of the following cell types is found lining the epididymis ?

    • Stratified cuboidal epithelium

    • Ciliated pseudostratified epithelium with goblet cells

    • Transitional epithelium

    • Pseudostratified columnar epithelium with stereocilia

    • Simple columnar epithelium with striated border and goblet cells

    Correct Answer
    A. Pseudostratified columnar epithelium with stereocilia
    Explanation
    The correct answer is pseudostratified columnar epithelium with stereocilia. This type of epithelium is found lining the epididymis, which is a coiled tube located on the posterior surface of the testis. Pseudostratified columnar epithelium is characterized by cells of varying heights, giving the appearance of multiple layers, although all cells are attached to the basement membrane. Stereocilia are long, non-motile microvilli that increase the surface area for absorption and secretion. This lining helps in the maturation, storage, and transportation of sperm cells.

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  • 5. 

    Which of the following junctions allows the cytoskeleton of the cell  to bind to Ca++ dependent cadherins?

    • Zonula occludens

    • Zonula adherens

    • Hemidesmosomes

    • Focal adhesions

    • Gap Junction

    Correct Answer
    A. Zonula adherens
    Explanation
    Zonula adherens is the correct answer because it is a type of junction that allows the cytoskeleton of the cell to bind to Ca++ dependent cadherins. Zonula adherens is a belt-like junction found in epithelial tissues, and it plays a role in cell-cell adhesion by connecting adjacent cells through cadherin proteins. These cadherins bind to the cytoskeleton of the cell, providing structural support and stability to the tissue.

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  • 6. 

    Plasma cells are derived from which of the following?

    • Macrophages

    • Fibroblast

    • T-lymphocytes

    • Monocytes

    • B-lymphocytes

    Correct Answer
    A. B-lymphocytes
    Explanation
    Plasma cells are derived from B-lymphocytes. B-lymphocytes are a type of white blood cell that play a crucial role in the immune response. When B-lymphocytes encounter an antigen, they differentiate into plasma cells, which produce and secrete antibodies specific to that antigen. These antibodies help to neutralize or eliminate the antigen, thereby protecting the body against infection.

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  • 7. 

    Which of the following statements is CORRECT for epithelia?

    • They are incapable of performing absorptive functions

    • Certain types may contain apical specializations

    • They are surrounded by an abundance of extracellular matrix

    • They demonstrate weak adhesion between cells

    • They are highly vacularized

    Correct Answer
    A. Certain types may contain apical specializations
    Explanation
    Certain types of epithelia may contain apical specializations. Epithelial tissues are one of the four main types of tissues in the human body and they line the surfaces of organs, glands, and cavities. They serve various functions including protection, secretion, absorption, and transportation. Apical specializations refer to specific structures or modifications found on the apical surface of certain epithelial cells, such as microvilli or cilia, which increase the surface area or aid in movement. Therefore, it is correct to say that certain types of epithelia may contain apical specializations.

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  • 8. 

    On the basal side of the cell, the cytoskeleton of the cell communicates with the extracellular matrix across the plasma membrane by means of

    • Cadherins

    • Integrins

    • Proteoglycans

    • Microtubules

    • Tonofilaments

    Correct Answer
    A. Integrins
    Explanation
    Integrins are transmembrane proteins that connect the cytoskeleton of a cell to the extracellular matrix. They act as bridges between the inside and outside of the cell, allowing for communication and signaling. Integrins play a crucial role in cell adhesion, migration, and tissue organization. They are involved in various cellular processes such as wound healing, immune response, and development. Therefore, integrins are the correct answer for the given question.

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  • 9. 

    Which of the following contributes to epithelial polarity?

    • Presence of an intact basal lamina

    • Gap junctions

    • Membrane fluidity

    • Presence of desmosomes

    • Location of golgi apparatus near the nucleus

    Correct Answer
    A. Presence of an intact basal lamina
    Explanation
    Epithelial polarity refers to the asymmetrical distribution of proteins and lipids within epithelial cells, which is essential for their proper function. The basal lamina is a thin layer of extracellular matrix that provides structural support to epithelial cells. It helps in maintaining the integrity and organization of the cells, contributing to their polarity. Therefore, the presence of an intact basal lamina is a crucial factor in establishing and maintaining epithelial polarity.

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  • 10. 

    Which one of the following statements about stratified squamous epithelium is FALSE?

    • The surface layer of cells may be keratinized

    • The cells in its most superficial layer are squamous

    • All cells are supported by a basal lamina

    • Its cells possess desmosomes

    • Some cells may show pigmentation

    Correct Answer
    A. All cells are supported by a basal lamina
    Explanation
    Stratified squamous epithelium is a type of tissue that consists of multiple layers of squamous (flat) cells. The surface layer of cells may be keratinized, meaning it contains a tough protein called keratin. The cells in the most superficial layer are indeed squamous in shape. The statement that is FALSE is "All cells are supported by a basal lamina." A basal lamina is a thin layer of extracellular matrix that underlies epithelial cells, but in stratified squamous epithelium, not all cells are in contact with the basal lamina. Some cells may show pigmentation, meaning they contain pigments that give color to the tissue. The cells in stratified squamous epithelium are held together by desmosomes, which are specialized cell junctions.

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  • 11. 

    Which of the following statements BEST describes basal folds?

    • They possess cilia

    • They function in exocytosis

    • They are involved in lipid transport

    • They are associated with cells involved in active transport

    • They make up part of the terminal web

    Correct Answer
    A. They are associated with cells involved in active transport
    Explanation
    Basal folds are associated with cells involved in active transport. This means that these folds are found in cells that actively transport substances across their membranes. These folds increase the surface area of the cell, allowing for more transport proteins to be present and therefore increasing the efficiency of active transport.

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Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Mar 21, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Dec 10, 2011
    Quiz Created by
    Chachelly
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