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Anatomy & Physiology: Tissue Types and Characteristics

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  • Simple Squamous Epithelium - Locations

    Mesothelia lining pleural, pericardial, and peritoneal cavities; endothelium lining heart and blood vessels; portions of kidney tubules; inner lining of cornea; alveoli of lungs.

  • Simple Squamous Epithelium - Functions

    Reduces friction; controls vessel permeability; performs absorption and secretion.

  • Stratified Squamous Epithelium - Locations

    Surface of skin; lining of mouth, throat, esophagus, rectum, anus, and vagina.

  • Stratified Squamous Epithelium - Functions

    Provides physical protection against abrasion, pathogens, and chemical attack.

  • Simple Cuboidal Epithelium - Locations

    Glands, ducts, portions of kidney tubules, thyroid gland.

  • Simple Cuboidal Epithelium - Functions

    Limited protection, secretion, absorption.

  • Stratified Cuboidal Epithelium - Locations

    Lining of some ducts (rare).

  • Stratified Cuboidal Epithelium - Functions

    Protection, secretion, absorption.

  • Simple Columnar Epithelium - Locations

    Lining of stomach, intestine, gallbladder, uterine tubes, and collecting ducts of kidneys.

  • Simple Columnar Epithelium - Functions

    Protection, secretion, absorption.

  • Pseudostratified Ciliated Columnar Epithelium - Locations

    Lining of nasal cavity, trachea, and bronchi; portions of male reproductive tract.

  • Pseudostratified Ciliated Columnar Epithelium - Functions

    Protection, secretion, moves mucus with cilia.

  • Transitional Epithelium - Locations

    Urinary bladder, renal pelvis, ureters.

  • Transitional Epithelium - Functions

    Permits expansion and recoil after stretching.

  • Areolar Tissue - Locations

    Within and deep to the dermis of skin, covered by epithelial lining of digestive, respiratory, and urinary tracts; between muscles; around joints; blood vessels and nerves.

  • Areolar Tissue - Functions

    Supports organs, permits independent movement, phagocytic cells provide defense against pathogens.

  • Adipose Tissue - Locations

    Deep to the skin, especially at sides, buttocks, breasts; padding around eyes and kidneys.

  • Adipose Tissue - Functions

    Provides padding and cushions shocks; insulates (reduces heat loss); stores energy.

  • Reticular Tissue - Locations

    Liver, kidney, spleen, lymph nodes, and bone marrow.

  • Reticular Tissue - Functions

    Provides supporting framework.

  • Dense Regular Connective Tissue - Locations

    Between skeletal muscles and skeleton (tendons and aponeuroses); between bones or stabilizing positions of internal organs (ligaments); covering skeletal muscles; deep fasciae.

  • Dense Regular Connective Tissue - Functions

    Provides firm attachment; conducts pull of muscles; reduces friction between muscles; stabilizes positions of bones.

  • Dense Irregular Connective Tissue - Locations

    Capsules of visceral organs; periosteum and perichondria; nerve and muscle sheaths; dermis.

  • Dense Irregular Connective Tissue - Functions

    Provides strength to resist forces applied from many directions; helps prevent overexpansion of organs such as the urinary bladder.

  • Elastic Tissue - Locations

    Between vertebrae of the spinal column (ligamentum flavum and ligamentum nuchae); ligaments supporting penis; ligaments supporting transitional epithelia; blood vessel walls.

  • Elastic Tissue - Functions

    Stabilizes positions of vertebrae and penis; cushions shocks; permits expansion and contraction of organs.

  • Red Blood Cells - Function

    Transport oxygen (and to a lesser degree, carbon dioxide) in the blood.

  • White Blood Cells - Function

    Help defend the body from infection and disease.

  • Platelets - Function

    Membrane-enclosed packets of cytoplasm that function in blood clotting.

  • Hyaline Cartilage - Locations

    Between tips of ribs and bones of sternum; covering bone surfaces at synovial joints; supporting larynx, trachea, and bronchi; forming part of nasal septum.

  • Hyaline Cartilage - Functions

    Provides stiff but somewhat flexible support; reduces friction between bony surfaces.

  • Fibrocartilage - Locations

    Pads within knee joint; between pubic bones of pelvis; intervertebral discs.

  • Fibrocartilage - Functions

    Resists compression; prevents bone-to-bone contact; limits movement.

  • Elastic Cartilage - Locations

    Auricle of external ear; epiglottis; auditory canal; cuneiform cartilages of larynx.

  • Elastic Cartilage - Functions

    Provides support but tolerates distortion without damage and returns to original shape.

  • Skeletal Muscle Tissue - Characteristics

    Cells are long, cylindrical, striated, and multinucleate.

  • Skeletal Muscle Tissue - Functions

    Moves or stabilizes the position of the skeleton; guards entrances and exits to the digestive, respiratory, and urinary tracts; generates heat; protects internal organs.

  • Cardiac Muscle Tissue - Characteristics

    Cells are short, branched, and striated, usually with a single nucleus; cells are interconnected by intercalated discs.

  • Cardiac Muscle Tissue - Functions

    Circulates blood; maintains blood (hydrostatic) pressure.

  • Smooth Muscle Tissue - Characteristics

    Cells are short, spindle-shaped, and nonstriated, with a single, central nucleus.

  • Smooth Muscle Tissue - Functions

    Moves food, urine, and reproductive secretions; controls diameter of respiratory passageways; regulates diameter of blood vessels.

  • Neurons - Function

    Transmit electrical impulses to communicate information throughout the body.

  • Neuroglia (Glial Cells) - Functions

    Maintain physical structure of tissues; repair tissue framework after injury; perform phagocytosis; provide nutrients to neurons; regulate composition of interstitial fluid surrounding neurons.