Cartilage Types and Functions
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Questions and Answers

What are cartilages made up of?

chondrocytes

How many types of adult cartilage are associated with areas of the skeleton?

  • Four
  • Three (correct)
  • Two
  • Five
  • Which type of cartilage contains no blood vessels?

  • All types of cartilage (correct)
  • Hyaline cartilage
  • Elastic cartilage
  • Fibrocartilage
  • What is the sheath of dense connective tissue surrounding most cartilaginous structures called?

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

    Articular cartilage contains perichondrium.

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

    What is the most abundant type of collagen in hyaline cartilage?

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

    What are the matrix cavities called that cartilage cells occupy?

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

    What is the approximate percentage of water in hyaline cartilage?

    <p>75% (A)</p> Signup and view all the answers

    Which type of cartilage is most susceptible to calcification during aging?

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

    Which feature is typical of elastic cartilage?

    <p>Collagen is mainly type II (B)</p> Signup and view all the answers

    The molecular basis for the shock absorbing properties of cartilage involves which of the following?

    <p>Hydration of glycosaminoglycans (B)</p> Signup and view all the answers

    What distinguishes cartilage from most other connective tissues?

    <p>It lacks blood vessels. (D)</p> Signup and view all the answers

    Which area in cartilage is relatively collagen-poor and proteoglycan-rich?

    <p>territorial matrix</p> Signup and view all the answers

    Flashcards

    Cartilage

    A tough form of supporting connective tissue with high GAGs and proteoglycans.

    Hyaline Cartilage

    The most common cartilage type, appearing homogeneous with Type II collagen.

    Elastic Cartilage

    Cartilage that contains elastic fibers, providing more flexibility.

    Fibrocartilage

    Cartilage that combines hyaline cartilage and dense connective tissue, providing toughness.

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    Chondrocytes

    Cartilage cells that maintain the cartilage matrix.

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    ECM (Extracellular Matrix)

    Matrix in cartilage rich in collagen, proteoglycans, and water.

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    Perichondrium

    Dense connective tissue surrounding most cartilages, essential for growth and repair.

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    Type II Collagen

    Primary collagen type found in hyaline and elastic cartilage.

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    Glycosaminoglycans (GAGs)

    Large polysaccharides in the cartilage matrix that bind water.

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    Aggrecan

    Main proteoglycan in hyaline cartilage, with many GAG side chains.

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    Avascular

    Refers to cartilage being devoid of blood vessels.

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    Interstitial Growth

    Growth of cartilage by mitosis of chondrocytes within the matrix.

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    Appositional Growth

    Growth of cartilage by chondroblasts from the perichondrium.

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    Territorial Matrix

    Matrix area surrounding each chondrocyte with high GAG concentration.

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    Interterritorial Matrix

    Matrix region between chondrocytes, with more collagen.

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    Osteoarthritis

    Degenerative joint disease involving cartilage wear and tear.

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    Calcification

    Process where cartilage becomes hardened with calcium deposits.

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    Chondrogenesis

    Development of cartilage from embryonic mesenchyme.

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    Chondroblasts

    Young cartilage cells that actively secrete matrix components.

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    Elastic Fibers

    Fibers that provide elasticity and flexibility to elastic cartilage.

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    Meniscus

    Crescent-shaped fibrocartilage in the knee joint that absorbs shock.

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    Pubic Symphysis

    Fibrocartilaginous joint between the pubic bones.

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    Chondrosarcoma

    Malignant tumor of cartilage that can arise from chondrocytes.

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    Shock Absorber

    Function of cartilage to provide cushioning in joints.

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    Joint Function

    Role of cartilage in providing smooth surfaces and flexibility in joints.

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    Nutrient Diffusion

    Process by which nutrients reach chondrocytes through surrounding connective tissues.

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    Hyaluronan

    Long polymer in cartilage that helps to bind water and maintain structure.

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    Binding Proteins

    Proteins that help link proteoglycans to collagen fibers.

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    Matrix Metalloproteinases

    Enzymes released during joint wear that contribute to cartilage degradation.

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    External Ear Cartilage

    Elastic cartilage providing structure and flexibility to the ear.

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    Study Notes

    Cartilage

    • Cartilage is a tough, durable supporting connective tissue
    • Its extracellular matrix (ECM) has high GAG and proteoglycan concentrations, interacting with collagen and elastic fibers
    • Cartilage has structural and protective roles in the skeleton and elsewhere (Figure 7-1)

    Types of Cartilage

    • Hyaline Cartilage:
      • Homogenous, glassy matrix
      • Primarily type II collagen, aggrecan
      • Found in articular surfaces of joints, respiratory tract, ribs, and epiphyseal plates
      • Provides smooth, low friction surfaces in joints, and structural support in the respiratory tract.
    • Elastic Cartilage:
      • Contains abundant elastic fibers
      • Provides support and flexibility
      • Found in the external ear, external auditory canals, and eustachian tubes
    • Fibrocartilage:
      • Mixture of hyaline cartilage and dense connective tissue
      • High tensile strength, cushioning properties
      • Found in intervertebral discs, pubic symphysis, and attachments of ligaments and tendons

    Cartilage Formation, Growth, and Repair

    • Develops from embryonic mesenchyme
    • Two types of growth:
      • Interstitial growth (existing chondrocytes divide and produce new matrix)
      • Appositional growth (new chondrocytes are added at the surface from the perichondrium)
    • Slow and comparatively ineffective repair process due to lack of blood vessels (avascular)

    Cartilage Cells

    • Chondrocytes are the main cells
    • Chondrocytes occupy lacunae in the matrix
    • Chondrocytes are derived from mesenchymal cells through chondrogenesis
    • Chondrocytes are responsible for synthesizing and maintaining the extracellular matrix

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    Related Documents

    Chapter 7: Cartilage PDF

    Description

    Explore the diverse types of cartilage and their functions in the body. This quiz covers hyaline, elastic, and fibrocartilage, detailing their structural features and locations. Test your knowledge on the essential roles cartilage plays in supporting various bodily functions.

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