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Basic Tissue Types and Body Membranes in Anatomy & Physiology

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  • What are the four basic tissue types and their general functions?
    Epithelial tissue: protection, permeability control, secretion.
    Connective tissue: support, connection, transport.
    Muscle tissue: movement.
    Nervous tissue: stimulus detection and signal transmission.
  • What are the main characteristics of epithelial tissue?
    Has an apical surface exposed to body or cavity, basal surface separating it from connective tissue, and a protein-carbohydrate basement membrane anchoring it. Controls permeability with tight and gap junctions.
  • List the functions of epithelial tissue.
    Protection from injury and infection, absorption of nutrients, secretion of mucus and hormones, waste removal, filtration, and response to stimuli.
  • How is epithelial tissue classified by shape and layers?
    Shapes: squamous (flat), cuboidal (box-shaped), columnar (tall).
    Layers: simple (one layer), stratified (multiple layers).
  • What is the function of simple squamous epithelium?
    Thin, flat cells ideal for diffusion and filtration due to minimal barrier thickness.
  • Describe the characteristics and function of simple cuboidal epithelium.

    Box-shaped cells specialized for mucus secretion and creation.

  • Pseudostratified columnar epithelium

    A single layer of cells with nuclei at different heights, making it look layered. It often features cilia and goblet cells and lines the upper respiratory tract (like the trachea)

  • What is stratified squamous epithelium specialized for?
    Multiple layers providing strength and protection against mechanical stress.
  • What is pseudostratified columnar epithelium?
    Irregularly arranged columnar cells with staggered nuclei, appearing multilayered but all cells contact the basement membrane.
  • What is unique about transitional epithelium?
    Can stretch and recoil without damage, allowing organs like the bladder to expand.
  • How do solutes and water move across epithelial cells?
    Solutes enter via the apical membrane and exit through the basolateral membrane; water moves mainly by osmosis following solutes through tight junctions.
  • What composes connective tissue and what are its main functions?
    Cells surrounded by extracellular matrix of protein fibers and ground substance; functions include support, protection, defense, and fluid transport.
  • Name the three categories of connective tissue.
    Connective tissue proper (loose and dense), fluid connective tissue (blood and lymph), and supporting connective tissue (cartilage and bone).
  • What are the three types of muscle tissue and their locations?
    Skeletal muscle: attached to bones, voluntary movement.
    Cardiac muscle: heart walls, involuntary.
    Smooth muscle: walls of organs and vessels, involuntary.
  • Describe skeletal muscle tissue.
    Striated, multinucleated cells attached to bones; voluntary movement, heat generation, and organ protection.
  • What are the key features of cardiac muscle tissue?
    Striated, involuntary muscle with intercalated discs that coordinate heart contractions.
  • What is the function of smooth muscle tissue?
    Involuntary muscle controlling vessel diameter and moving substances through organs like intestines and bladder.
  • What are the major cell types in nervous tissue?
    Neurons transmit signals; neuroglia support and protect neurons.
  • What is the role of neuroglia in nervous tissue?
    Protect neurons and maintain the environment by connecting to neurons and surrounding interstitial fluid.
  • Describe the cutaneous membrane.
    The skin covering the body; protects against germs, sunlight, physical damage, and helps regulate temperature; supported by areolar and dense irregular connective tissue.