أسئلة المحاضرة السابعة هستو (قبل التعديل)
58 Questions
0 Views

أسئلة المحاضرة السابعة هستو (قبل التعديل)

Created by
@inspireeAcademy

Podcast Beta

Play an AI-generated podcast conversation about this lesson

Questions and Answers

Which of the following glands are primarily formed of numerous cells?

  • Thyroid G.
  • Testes
  • Salivary glands (correct)
  • Suprarenal G.
  • Which type of gland secretion is known for being watery and rich in enzymes?

  • Parotid glands (correct)
  • Ceruminous glands
  • Sebaceous glands
  • Goblet cells
  • What secretion type is characteristic of both submandibular and sublingual glands?

  • Fatty secretion
  • Both types of secretions (correct)
  • Watery solution with waste products
  • Waxy secretion
  • Which gland secretion method involves the entire cell and its contents being released?

    <p>Holocrine</p> Signup and view all the answers

    Which of the following glands are formed of a single cell type?

    <p>Goblet cells</p> Signup and view all the answers

    What is one of the primary functions of epithelial tissue?

    <p>Protection against physical damage</p> Signup and view all the answers

    Which characteristic describes the cellular arrangement of epithelial tissue?

    <p>Cohesiveness with close contact between cells</p> Signup and view all the answers

    Which type of epithelial tissue has multiple layers of cells?

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

    What feature distinguishes simple epithelial tissues from stratified ones?

    <p>Single layer of cells resting on the basement membrane</p> Signup and view all the answers

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

    <p>Adhering the epithelial tissue to connective tissue</p> Signup and view all the answers

    Which type of epithelium is specialized for secretion and forms glands?

    <p>Glandular epithelium</p> Signup and view all the answers

    How does the epithelial tissue regenerate?

    <p>Via continuous renewal of its cells</p> Signup and view all the answers

    What is a unique characteristic of pseudostratified columnar epithelium?

    <p>It has a single layer but appears multilayered</p> Signup and view all the answers

    What characteristic is unique to transitional epithelium?

    <p>Its surface cells undergo changes in shape.</p> Signup and view all the answers

    How does the number of layers in transitional epithelium change when the bladder is full?

    <p>It changes to 2 or 3 layers.</p> Signup and view all the answers

    Which of the following is NOT a location where transitional epithelium is found?

    <p>Recto-Anal junction</p> Signup and view all the answers

    What type of glands are formed by cells specialized to secrete substances?

    <p>Glandular epithelia</p> Signup and view all the answers

    Which substance is typically found between the cells in transitional epithelium?

    <p>Mucous substance</p> Signup and view all the answers

    Which gland secretes hormones directly into the bloodstream?

    <p>Pituitary gland</p> Signup and view all the answers

    What is a characteristic feature of cells in glandular epithelia?

    <p>They contain secretory granules.</p> Signup and view all the answers

    What is the typical function of large ducts of salivary glands?

    <p>To secrete saliva.</p> Signup and view all the answers

    Which type of epithelium is characterized by a monolayer of crowded columnar cells with oval nuclei at different levels?

    <p>Pseudostratified columnar epithelium</p> Signup and view all the answers

    Where is simple columnar absorptive epithelium primarily found?

    <p>Small intestine</p> Signup and view all the answers

    What distinguishes pseudostratified columnar epithelium with motile cilia from non-motile ciliated forms?

    <p>Presence of goblet cells</p> Signup and view all the answers

    In which anatomical location would you most likely find stratified squamous non-keratinized epithelium?

    <p>Esophagus</p> Signup and view all the answers

    What feature is unique to simple columnar ciliated epithelium found in bronchioles?

    <p>Cilia present</p> Signup and view all the answers

    What is the primary function of the keratinized layer in stratified squamous epithelium?

    <p>Preventing water loss</p> Signup and view all the answers

    Which of the following structures does NOT contain pseudostratified columnar epithelium with motile cilia?

    <p>Epididymis</p> Signup and view all the answers

    Which type of epithelium covers the oral cavity and is important for protection?

    <p>Stratified squamous non-keratinized epithelium</p> Signup and view all the answers

    What is one primary function of epithelial tissue that assists in the movement of substances across its surface?

    <p>Forms slippery surfaces</p> Signup and view all the answers

    Which gland is characterized by having both tubular and acinar secretory parts?

    <p>Submandibular glands</p> Signup and view all the answers

    What happens to the superficial cell layer of transitional epithelium when the urinary bladder is full?

    <p>It stretches and flattens temporarily.</p> Signup and view all the answers

    Which type of epithelial tissue is specifically characterized by its columnar tall cells that often give a false appearance of stratification?

    <p>Pseudostratified columnar epithelium</p> Signup and view all the answers

    What is a characteristic feature of cells within glandular epithelia?

    <p>They are specialized to secrete substances.</p> Signup and view all the answers

    Which type of epithelium is formed by multiple layers of cells and provides protection against abrasion?

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

    What type of secretion is typically produced by ceruminous glands?

    <p>Waxy secretion</p> Signup and view all the answers

    What distinguishes simple columnar absorptive epithelium from other types of columnar epithelium?

    <p>Presence of microvilli</p> Signup and view all the answers

    Which of the following glands releases secretions via exocytosis?

    <p>Mammary glands</p> Signup and view all the answers

    Which type of epithelium would you primarily find lining the nasal cavity and respiratory tract due to its motile cilia?

    <p>Pseudostratified columnar epithelium with motile cilia</p> Signup and view all the answers

    What characteristic of epithelial cells allows them to maintain their structural integrity?

    <p>Cellularity and cohesion</p> Signup and view all the answers

    Which of the following statements accurately describes transitional epithelium?

    <p>It undergoes transitions in cell shape based on urinary bladder pressure.</p> Signup and view all the answers

    Which type of epithelial tissue typically has microvilli or cilia on its surface?

    <p>Pseudostratified columnar epithelium</p> Signup and view all the answers

    Which specific type of secretion is produced by the parotid glands?

    <p>Water-rich solution with enzymes</p> Signup and view all the answers

    What type of glandular arrangement is described as 'ductless'?

    <p>Endocrine glands</p> Signup and view all the answers

    Which anatomical locations are primarily covered by stratified squamous non-keratinized epithelium?

    <p>Esophagus and vaginal canal</p> Signup and view all the answers

    In which of the following locations would you find simple columnar ciliated epithelium?

    <p>Fallopian tube</p> Signup and view all the answers

    Which feature is essential for the regeneration of epithelial tissue?

    <p>High capacity for continuous renewal</p> Signup and view all the answers

    What is the secretion characteristic of sebaceous glands?

    <p>Fatty secretion rich in enzymes</p> Signup and view all the answers

    Which structural adaptation allows transitional epithelium to accommodate varying degrees of stretching?

    <p>Ability of cells to swell and contract.</p> Signup and view all the answers

    Which type of glandular epithelium is involved in secretion within glands?

    <p>Glandular epithelium</p> Signup and view all the answers

    In transitional epithelium, what is the composition that facilitates cell movement during fullness?

    <p>Mucous substance between the cells.</p> Signup and view all the answers

    Which characteristic feature allows stratified squamous keratinized epithelium to provide a protective barrier?

    <p>Layering of flat scaly cells filled with keratin</p> Signup and view all the answers

    What is a main characteristic of simple cuboidal epithelium?

    <p>Single layer of cube-shaped cells</p> Signup and view all the answers

    Which statement best describes the basal cells found in pseudostratified columnar epithelium?

    <p>They provide structural support for the epithelium.</p> Signup and view all the answers

    What type of cells are primarily found in the superficial layer of transitional epithelium?

    <p>Large cuboidal cells.</p> Signup and view all the answers

    Which of the following locations is NOT primarily lined by transitional epithelium?

    <p>Esophagus</p> Signup and view all the answers

    What is a primary function of goblet cells found in certain types of epithelium?

    <p>Secreting mucus</p> Signup and view all the answers

    What occurs to transitional epithelium when the bladder is full?

    <p>It thickens and the layers flatten</p> Signup and view all the answers

    Study Notes

    Epithelial Tissue

    • One of the four main types of tissue in the human body
    • Covers external and internal surfaces of the body
    • Forms most glands
    • Highly cellular, with cells in close contact
    • Polarized; apical and basal surfaces
    • Rests on a basement membrane
    • Avascular; nutrients and waste products transported by diffusion from underlying connective tissue
    • Highly innervated
    • Regenerative; high capacity for renewal
    • Functions include protection, secretion, absorption, filtration, ion transportation, and creating slippery surfaces

    Classifications of Epithelial Tissues

    • Simple Epithelia: Single layer of cells
      • Simple Squamous Epithelium: Flat, thin cells with centrally-located, flat nuclei
        • Found in endothelium (lining of blood vessels) and mesothelium (lining of serous membranes)
      • Simple Cuboidal Epithelium: Cube-shaped cells with centrally-located, rounded nuclei
        • Found in renal tubules, thyroid follicles, and small ducts of exocrine glands
      • Simple Columnar Epithelium: Tall, columnar cells with centrally-located, oval nuclei
        • Found in the lining of the stomach (secretory) and small intestine (absorptive)
        • Can have microvilli for increased absorption
        • Can have cilia for movement of substances
      • Pseudostratified Columnar Epithelium: Monolayer of cells with all resting on the basement membrane, but with some cells shorter than others, creating an illusion of stratification
        • Found in the lining of the respiratory tract, large ducts of salivary glands, epididymis, and fallopian tubes
        • May have cilia for movement of substances
        • May have goblet cells for mucus secretion
    • Stratified Epithelia: Multiple layers of cells
      • Stratified Squamous Epithelium: Multiple cell layers with flat cells at the surface
        • Non-keratinized: Found in moist areas like oral cavity, esophagus, anal canal, vagina, urethra
        • Keratinized: Found in dry areas like the epidermis of skin
      • Stratified Cuboidal (Transitional) Epithelium: Shape of superficial cells changes depending on stretch and pressure
        • Found in the urinary bladder, pelvis of kidney, ureter, prostatic urethra
        • Allows for expansion and contraction
      • Stratified Columnar Epithelium: Multiple layers of cells with columnar cells at the surface
        • Found in large ducts of salivary glands, recto-anal junction, and male urethra

    Glandular Epithelium

    • Specialized for secretion
    • Secretory granules store molecules to be secreted
    • Divided into two types:
      • Exocrine Glands: Have ducts; secretions carried to epithelial surface
        • Examples: sweat glands, sebaceous glands, salivary glands
      • Endocrine Glands: Ductless; secretions (hormones) released directly into the bloodstream
        • Examples: pineal gland, pituitary gland, thyroid gland, suprarenal glands, testes, ovaries
    • Glandular epithelium can be unicellular or multicellular
    • Examples of unicellular glands: goblet cells
    • Examples of multicellular glands: salivary glands, pancreas

    Types of Multicellular Glands

    • Tubular: Tubular secretory part
      • Examples: kidney, liver, testes, intestinal glands
    • Acinar: Grape-like or acinar secretory part
      • Examples: sebaceous glands
    • Tubuloacinar: Possess both tubular and alveolar parts
      • Examples: salivary glands, mammary glands, pancreas, prostate gland

    Types of Glandular Secretions

    • Mucous: Viscid, rich in carbohydrates
      • Examples: goblet cells, minor salivary glands
    • Serous: Watery, rich in enzymes
      • Examples: parotid glands, pancreas
    • Mixed: Combination of mucous and serous secretions
      • Examples: submandibular and sublingual glands
    • Fatty: Secreted from sebaceous glands and meibomian glands
    • Waxy: Secreted from ceruminous glands of external ear canal

    Modes of Exocrine Secretion

    • Exocytosis: Secretion via membrane-bound vesicles
      • Examples: sweat glands, salivary glands, mammary glands
    • Holocrine Secretion: Cells lyse and release entire contents
      • Examples: sebaceous glands, meibomian glands

    Epithelium

    • Epithelium tissues cover the outer surface of the body and inner surfaces of cavities.
    • The cells are closely packed together with intercellular junctions.
    • Epithelial tissue has a distinct apical and basal surface.
    • The basal surface adheres to the basement membrane (BM).
    • Epithelial cells can have modifications on their surface, such as microvilli or cilia.
    • Epithelial tissue is avascular and nutrients are transported by diffusion from blood vessels in the connective tissue (CT).
    • Epithelial tissue is highly innervated and has the ability to regenerate rapidly.

    Functions of Epithelium

    • Protection
    • Secretion
    • Absorption
    • Filtration barrier
    • Ion or gases transport
    • Forms slippery surfaces

    Types of Epithelial Tissue

    • Covering and lining epithelium (external and internal surfaces)
    • Glandular epithelium (secretory tissue in glands)
    • Neuroepithelium

    Classification of Epithelial Tissues

    Simple Epithelium

    • Simple Squamous Epithelium: Single layer of flat and thin cells with central, flat nuclei.
      • Endothelium lines the heart, blood vessels, and lymph vessels.
      • Mesothelium lines serous membranes around organs (pericardium, pleura, peritoneum).
    • Simple Cuboidal Epithelium: Single layer of square shaped cells with central, rounded nuclei.
      • Found in renal tubules, thyroid follicles, and small ducts of exocrine glands (e.g., salivary glands).
    • Simple Columnar Epithelium: Single layer of columnar, tall cells with basal oval nuclei.
      • Simple columnar epithelium can be secretory (e.g., stomach) or absorptive (e.g., small intestine - contains numerous microvilli).
      • Simple columnar ciliated epithelium is found in bronchioles and fallopian tubes.

    Pseudostratified Columnar Epithelium

    • This type of epithelium is formed of a single layer of crowded cells where all cells rest on the BM.
    • Some cells are short and fail to reach the surface, while the tall cells with oval nuclei reach the free surface.
    • With the different heights of cells, and oval nuclei positioned at different levels, the appearance is that of a stratified epithelium.
    • Pseudostratified columnar epithelium can be non-ciliated (e.g., large ducts of salivary glands) or ciliated with goblet cells (e.g., nasal cavity, trachea, bronchi).
    • Pseudostratified columnar epithelium with non-motile cilia is found in the epididymis.

    Stratified Epithelium

    • Stratified Squamous Epithelium: Composed of multiple layers of cells, the basal layer rests on the BM.
      • Classified according to the shape of the superficial cell layer.
      • Stratified Squamous Non-Keratinized Epithelium: Upper layer of cells is formed of flat, non-dried, non-horny cells with central, rounded nuclei. Found in wet mucosas, such as the cornea, conjunctiva, oral cavity, esophagus, anal canal, urethra, and vagina.
      • Stratified Squamous Keratinized Epithelium: Upper layer of cells is formed of flat, dried, horny, scaly cells filled with keratin. Found on the dry surface of the skin (epidermis).
    • Stratified Cuboidal Epithelium (Transitional): Found in the urinary bladder, ureters, pelvis of the kidney, and prostatic urethra.
      • The shape of the surface cells changes depending on the degree of stretch and pressure inside the urinary bladder.
      • The cells rest on a thin BM, which can contract and expand.
      • Formed from 5-8 layers, with columnar cells at the base, and large cubical cells with convex upper surface, central rounded nuclei (some binucleated) at the apex.
      • The number of cell layers can change to 2 or 3 in a full bladder.
      • The presence of mucous substance between the cells facilitates cell sliding during bladder distension.
      • The superficial cell layer stretches and flattens temporarily.
    • Stratified Columnar Epithelium: Composed of multiple cell layers with columnar cells at the surface.
      • Found in large ducts of salivary glands, the recto-anal junction, and the membranous part of the male urethra.

    Glandular Epithelium

    • Glandular epithelia are found in glands and are specialized for secretion.
    • Secretory products are stored in small membrane-bound vesicles called secretory granules.
    • Two types of glands:
      • Exocrine Glands: Have ducts and release their secretions into ducts.
        • Examples: sweat glands, sebaceous glands, salivary glands.
      • Endocrine Glands: Ductless, secrete hormones directly into the blood.
        • Examples: pituitary gland, thyroid gland, adrenal gland, pancreas, testes, ovaries.

    Types of Exocrine Glands

    • Simple: Formed of a single cell (e.g., goblet cells) or numerous cells (e.g., salivary and pancreatic glands).
    • Compound: Formed by a combination of types.
    • Tubular: Secretory portion is tubular (e.g., kidney, liver, testes, intestinal glands).
    • Acinar: Secretory portion is grape-like or acinar shapes (e.g., sebaceous glands).
    • Tubulo-alveolar: Possess both tubular and alveolar structures (e.g., salivary glands, mammary glands, pancreas, prostate glands).

    Mechanisms of Secretion

    • Exocytosis: Cells secrete via exocytosis (e.g., sweat glands, salivary glands, mammary glands).
    • Membrane-bound vesicles: Cells secrete via membrane-bound vesicles (e.g., sebaceous glands, meibomian glands).
    • Cell lysis: The cell lysis and releases the entire contents of the cytoplasm and cell membrane during secretion (e.g., sebaceous glands, meibomian glands).

    Summary of Secretion Types

    • Viscid mucous poor in enzymes: Goblet cells and minor salivary glands.
    • Watery solution rich in enzymes: Parotid glands and pancreas.
    • Both types of secretions: Submandibular and sublingual glands.
    • Watery secretion containing some enzymes and waste products: Sweat glands.
    • Fatty secretion: Sebaceous and meibomian glands.
    • Waxy secretion: Ceruminous glands of the external ear canal.
    • Produce cells: Testis and ovary.

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Related Documents

    More Like This

    Tessuto Epiteliale - Principali Caratteristiche
    40 questions
    Epithelial Membranes Overview
    33 questions

    Epithelial Membranes Overview

    BestPerformingBlue7038 avatar
    BestPerformingBlue7038
    Overview of Human Tissues
    32 questions
    Epithelial Tissue Overview
    31 questions
    Use Quizgecko on...
    Browser
    Browser