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Anatomy & Physiology: Tissue Types and Structures

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  • What are the 4 types of tissues found in the body?

    Epithelial, connective, muscle, and nervous tissues.

  • What is the extracellular matrix and its main components?

    The extracellular matrix is a network outside cells composed of ground substance, GAGs, proteoglycans, glycoproteins, collagen, elastin, and reticular fibers that provide structural support and regulate cell behavior.

  • What is the function of ground substance in the extracellular matrix?

    Ground substance is a gel-like material that fills space between cells and fibers, facilitating nutrient and waste exchange.

  • What roles do glycosaminoglycans (GAGs) and proteoglycans play in connective tissue?

    GAGs attract water to keep tissues hydrated; proteoglycans form large complexes that provide cushioning and support.

  • What is the function of collagen fibers in connective tissue?

    Collagen fibers provide tensile strength and resist stretching forces.

  • How do elastin fibers differ from collagen fibers?

    Elastin fibers allow tissues to stretch and recoil, providing elasticity, unlike collagen which resists stretch.

  • What are reticular fibers and their function?

    Reticular fibers form a delicate, supportive meshwork in soft tissues like lymph nodes and bone marrow.

  • What are the main types of cell junctions and their functions?

    Tight junctions seal cells to prevent leaks, desmosomes anchor cells for strength, and gap junctions allow communication via ion passage.

  • List characteristic features of epithelial tissues.

    Cellularity, polarity, attachment to basement membrane, avascularity, and high regeneration capacity.

  • How are epithelial tissues classified by layers and shape?

    By layers: simple (one layer) or stratified (multiple layers). By shape: squamous (flat), cuboidal (cube-shaped), columnar (tall).

  • Where are simple squamous epithelial tissues found and what is their function?

    Found in alveoli and blood vessels, they allow rapid diffusion due to their thinness.

  • What is the general function of connective tissues?

    They provide support, protection, insulation, and transportation of substances within the body.

  • Name the 4 types of connective tissue proper.

    Loose connective tissue, dense regular, dense irregular, and reticular connective tissue.

  • What distinguishes dense regular from dense irregular connective tissue?

    Dense regular has parallel collagen fibers for tensile strength in one direction; dense irregular has randomly arranged fibers for strength in multiple directions.

  • What are specialized connective tissues?

    Types include cartilage, bone, blood, and adipose tissue, each with unique structure and function.

  • What are the three types of muscle tissue and their locations?

    Skeletal muscle (attached to bones), cardiac muscle (heart), and smooth muscle (walls of hollow organs).

  • Describe the structure of a typical neuron.

    A neuron has a cell body (soma), dendrites for receiving signals, and a single axon for transmitting impulses.

  • How are different tissue types organized into organs?

    Organs are composed of multiple tissue types working together to perform specific functions.

  • What are the four types of membranes found in the body?

    Mucous, serous, cutaneous, and synovial membranes.

  • Define mesothelium, epithelium, and endothelium.

    Mesothelium lines body cavities, epithelium covers body surfaces, and endothelium lines blood vessels.

  • What is the difference between mucus and mucous?

    Mucus is the slippery secretion; mucous describes tissues that produce mucus.