Tissue types, components and functions 2/11 L.2

Components of Connective Tissue

  • Connective tissue has three main components:

    • Ground Substance

    • Fibers

    • Cells

Ground Substance

  • Comprises water and glycoaminoglycans (sugar-protein molecules).

  • Plays a vital role in maintaining the structural integrity of connective tissue.

Fibers

  • Fibers are proteins produced and secreted by cells, found in the extracellular matrix.

  • Types of fibers include:

    • Collagen Fibers

      • Formed from smaller protein subunits that wind together to create a helical structure.

      • Example: Achilles tendon, which can rupture.

    • Elastic Fibers

      • Allow tissue to stretch and recoil, working alongside collagen fibers.

    • Reticular Fibers

      • Short fibers that do not form strong or elastic networks.

      • Function as filters in various tissues.

Importance of Cell Types in Connective Tissue

  • Cells in connective tissue have distinct physical characteristics, determining their future functions.

  • The mesoderm layer holds significance as the common link for connective tissue types.

Key Terms

  • Blast Cells

    • E.g., chondroblast (produces cartilage), which is mitotically capable.

    • Differentiate into chondrocytes, located at the cartilage surface, while chondrocytes exist within the cartilage itself.

Bone Types

  • Two primary types of bone:

    • Compact Bone

    • Spongy Bone

      • Note: "Spongy" does not imply softness; all bone is hard.

  • Bone hardness results from collagen secretion followed by mineral deposition, cementing the structure.

Embryonic Development

  • Before birth, mesenchymal cells form embryonic connective tissue rich in ground substance.

  • Loose connective tissue is produced by fibroblasts, characterized by fibers and abundant ground substance.

Clinical Relevance

  • Injuries like meniscus tears in the knee often cause pain not from cartilage damage but from the damage to surrounding tissues with nerve endings.