Respiratory System Anatomy Quiz
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Questions and Answers

What structure is primarily responsible for the thick basement membrane in the respiratory tract?

  • Epithelium with goblet cells
  • Seromucous glands
  • Lamina propria
  • Thick basal lamina (correct)
  • Which of the following accurately describes the composition surrounding the bronchi?

  • Completely surrounded by lung tissue only
  • Surrounded by skeletal muscle and fat
  • Surrounded by smooth muscle only
  • Surrounded by hyaline cartilage and connective tissue (correct)
  • What distinguishes primary and secondary bronchi from other structures in the respiratory system?

  • Absence of seromucous glands
  • Thin lumen surrounding only
  • Presence of cilia only
  • Hyaline cartilage plates and connective tissue blending with the adventitia (correct)
  • Which feature is NOT typically associated with the bronchi?

    <p>Lumen that is thickened on both sides (C)</p> Signup and view all the answers

    Why is a certain structure identified as neither primary nor secondary bronchi?

    <p>It is not surrounded by lung tissue (B)</p> Signup and view all the answers

    What type of epithelium lines the bronchiole?

    <p>Simple columnar epithelium (B)</p> Signup and view all the answers

    How are the nuclei arranged in the cells lining the bronchiole?

    <p>In one row (C)</p> Signup and view all the answers

    What characteristic distinguishes the cells in the bronchiole from other types of epithelial cells?

    <p>Smaller cell size (C)</p> Signup and view all the answers

    Which of the following statements accurately describes the bronchiole cells?

    <p>They consist of smaller cells arranged in a single layer. (D)</p> Signup and view all the answers

    Which feature is least likely to be associated with the bronchiole lining?

    <p>Multiple cell layers (C)</p> Signup and view all the answers

    What primary feature distinguishes conducting bronchioles from other airways?

    <p>Smooth muscle composition (A)</p> Signup and view all the answers

    Which type of epithelium lines the conducting bronchioles?

    <p>Simple columnar ciliated epithelium (B)</p> Signup and view all the answers

    At what point does the conducting bronchioles transition to the terminal bronchioles?

    <p>At the branching into smaller bronchioles (A)</p> Signup and view all the answers

    What is absent in the structure of conducting bronchioles?

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

    Which characteristic is most likely to be found only in terminal bronchioles?

    <p>Gas exchange structures (A)</p> Signup and view all the answers

    What defines extra pulmonary bronchi?

    <p>They consist of primary and secondary (lobar) bronchi. (D)</p> Signup and view all the answers

    Which type of bronchi is classified as intra pulmonary bronchi?

    <p>Tertiary (segmental) bronchi (C)</p> Signup and view all the answers

    What is a key characteristic of intra pulmonary bronchi?

    <p>They are surrounded by lung tissue. (C)</p> Signup and view all the answers

    What distinguishes primary and secondary bronchi from tertiary bronchi?

    <p>Location within the lung. (C)</p> Signup and view all the answers

    What conclusion can be drawn about terminal bronchi?

    <p>They are the last division of intra pulmonary bronchi. (A)</p> Signup and view all the answers

    What is the correct description of the mucosa in the respiratory system?

    <p>Composed of respiratory epithelium and lamina propria (D)</p> Signup and view all the answers

    Which component is NOT found in the submucosa of the respiratory system?

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

    What role does MALT play in the respiratory system?

    <p>Participates in immune responses (B)</p> Signup and view all the answers

    Which of the following accurately describes the respiratory epithelium?

    <p>It is composed of ciliated cells for mucus transport. (B)</p> Signup and view all the answers

    What is the primary function of the lamina propria in the mucosa?

    <p>Provides structural support and houses blood vessels. (D)</p> Signup and view all the answers

    What type of epithelium primarily constitutes the alveoli?

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

    Which cells are responsible for secreting surfactant in the alveoli?

    <p>Type II pneumocytes (D)</p> Signup and view all the answers

    What is the primary function of Clara cells in the respiratory bronchioles?

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

    What connects the respiratory bronchioles to the alveolar ducts?

    <p>Alveolar sacs (A)</p> Signup and view all the answers

    Which structure contains collagen and elastic fibers important for the alveolar architecture?

    <p>Inter alveolar septum (D)</p> Signup and view all the answers

    What is the composition of the mesothelium of the visceral pleura?

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

    Which of the following contributes to the thicker wall of respiratory bronchioles compared to alveolar ducts?

    <p>Greater presence of smooth muscle (C)</p> Signup and view all the answers

    Which component is not found in the alveolar sac or duct?

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

    What function does the inter alveolar septum serve?

    <p>Separate adjacent alveoli (C)</p> Signup and view all the answers

    What is the primary role of alveolar macrophages (dust cells)?

    <p>Phagocytosis of debris (C)</p> Signup and view all the answers

    Flashcards

    Lamina propria

    A thin layer of connective tissue beneath the epithelium, providing structural support and containing blood vessels for nutrient supply.

    Goblet cells

    Specialized cells in the epithelium that secrete mucus, aiding in lubrication and protection.

    Perichondrium

    A layer of connective tissue that surrounds the bronchi, providing both structure and flexibility.

    Adventitia

    The outer layer of the bronchus, composed of connective tissue that helps anchor it to surrounding lung tissue.

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    Hyaline cartilage

    A type of cartilage found in the bronchi, providing structural support and flexibility to maintain airway patency.

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    What are extrapulmonary bronchi?

    The large airways outside the lungs, including the primary and secondary bronchi, connect to the trachea and divide into smaller airways.

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    What are intrapulmonary bronchi?

    The airways within the lungs, starting from the tertiary bronchi to the terminal bronchi, are surrounded by lung tissue and branch into even smaller bronchioles.

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    What are lobar bronchi?

    The primary and secondary bronchi are also known as lobar bronchi because they supply air to the lobes of the lungs.

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    What are segmental bronchi?

    The tertiary bronchi are also known as segmental bronchi, supplying air to different segments of the lungs.

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    What are terminal bronchi?

    Terminal bronchi branch into even smaller respiratory bronchioles, which lead to the alveoli where gas exchange occurs.

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    Bronchiole

    A type of airway in the lungs, smaller than a bronchus, lined with a single layer of tall, narrow cells with nuclei arranged in a single row.

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    Simple columnar epithelium

    The lining of the bronchiole, composed of a single layer of tall, narrow cells.

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    Smaller cells

    The cells that make up the simple columnar epithelium in the bronchiole are smaller than those found in the larger bronchi.

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    Nuclei in one row

    The nuclei of the simple columnar epithelial cells in the bronchiole are arranged in a single row.

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    Bronchiole structure

    The structure of the bronchiole is different from the larger bronchi, including a thinner wall, smaller diameter, and simpler epithelial lining.

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    Mucosa (Airways)

    The innermost layer of the airway, composed of respiratory epithelium, which facilitates gas exchange and traps inhaled particles, and lamina propria, containing supporting smooth muscle and glands, which contributes to airway constriction and mucus production.

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    Submucosa (Airways)

    The layer beneath the mucosa, providing structural support and containing glands, which secrete mucus, and sometimes cartilage segments, depending on the airway size, for flexibility and patency.

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    MALT (mucosa-associated lymphoid tissue)

    A specialized type of lymph tissue found in the lamina propria of the airway's mucosa, which plays a crucial role in the immune response to inhaled pathogens.

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    Cartilage (Airways)

    A specialized tissue type that provides semi-rigid support and flexibility to the airways, especially the larger ones. Its presence helps maintain airway patency, preventing collapse.

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    Adventitia (Airways)

    The outermost layer of the airway is typically absent in the lungs. It is usually found in other parts of the respiratory system.

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    What are conducting bronchioles?

    Airways that branch off from the trachea, lack cartilage but have smooth muscles, connect to the terminal bronchiole.

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    What are terminal bronchioles?

    The smallest bronchioles that lead directly to the alveoli, where gas exchange occurs.

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    What are respiratory bronchioles?

    These are the air passages within the lungs that connect the terminal bronchioles to the alveoli; where oxygen enters the bloodstream from the lungs.

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    What is the function of the termination of the terminal bronchiole?

    The branch point of the terminal bronchiole, branching into even smaller structures, marking the transition to respiratory bronchioles.

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    What are alveoli?

    The functional unit of gas exchange in the lung, tiny air sacs surrounded by capillaries for oxygen intake and carbon dioxide removal.

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    Alveoli

    The smallest air sacs in the lungs where gas exchange occurs.

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    Alveolar Sac

    A cluster of alveoli, resembling a bunch of grapes, increasing the surface area for gas exchange.

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    Alveolar Duct

    A small airway that connects to multiple alveolar sacs, leading to the alveoli.

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    Respiratory Bronchiole

    A small airway that connects to the terminal bronchiole, marking the transition to gas exchange.

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    Inter Alveolar Septum

    A thin membrane that separates the alveoli from capillaries, facilitating gas exchange.

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    Type I Pneumocyte

    A type of cell found lining the alveoli, responsible for gas exchange.

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    Type II Pneumocyte

    A type of cell found in the alveoli, responsible for producing surfactant, which reduces surface tension.

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    Surfactant

    A fluid secreted by the type II pneumocytes lining the alveoli, reducing surface tension and preventing alveoli from collapsing.

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    Alveolar Macrophage

    A type of cell found in the alveoli, acting as a scavenger for dust particles and other debris.

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    Pleural Fluid

    A fluid secreted by the mesothelium of the visceral pleura, providing lubrication to the surfaces of the lungs.

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    Study Notes

    Histology of the Trachea, Esophagus, Bronchi, Bronchioles, Alveolar Ducts, and Alveoli

    • Trachea:
      • Contains C-shaped hyaline cartilage
      • Lined with pseudostratified columnar epithelium with goblet cells
      • Submucosa with seromucous glands
      • Adventitia layer
      • Trachealis muscle in the fibromuscular membrane
    • Esophagus:
      • Mucosa with epithelium containing goblet cells
      • Basal lamina
      • Lamina propria
      • Submucosa (blood vessels, connective tissue)
      • Cartilage (hyaline, basophilic, rich in sulfated GAGs)
      • Perichondrium (thicker towards adventitia)
      • Adventitia
      • Oblique section may show multiple cartilages
    • Bronchi:
      • Hyaline cartilage plates
      • Respiratory epithelium
      • Lamina propria (smooth muscle)
      • Submucosa (glands, cartilage segments)
        • Extra-pulmonary bronchi outside lungs
        • Intra-pulmonary bronchi inside lungs (tertiary to terminal)
      • No intra-pulmonary adventitia
    • Bronchioles:
      • Conducting bronchioles (no cartilage or submucosal glands)
      • Smooth muscle
      • Simple columnar epithelium
      • Cilia present
    • Respiratory Bronchioles, Alveolar Ducts, Alveoli:
      • Thin walls, simple cuboidal ciliated epithelium
      • Alveolar ducts and alveoli for gas exchange
      • Alveolar sacs
      • Club/Clara cells (non-ciliated)
      • Smooth muscle
      • Simple cuboidal epithelium
      • Alveolar macrophages (dust cells)
      • Alveolar capillaries
      • Pleura
    • Epithelium of Alveoli:
      • Simple squamous epithelium (mostly type I pneumocytes, some type II)
      • Type II surfactant-producing cells

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    Related Documents

    Sheet Lab 5 PDF

    Description

    Test your knowledge on the structures and functions within the respiratory tract, focusing on bronchi and bronchioles. This quiz covers various aspects such as epithelium types, basement membranes, and distinguishing features of primary and secondary bronchi.

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