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Connective and Epithelial Tissue Types in Anatomy & Physiology

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  • What are the primary components of connective tissue proper?

    Cells: fibroblasts, macrophages, mast cells, plasma cells, adipocytes, lymphocytes.
    Fibers: collagen, elastic, reticular.
    Ground substance: gel-like matrix surrounding cells and fibers.

  • Where is areolar connective tissue found and what are its functions?

    Located within and deep to dermis, around digestive, respiratory, urinary tracts, muscles, nerves, and blood vessels.
    Functions: cushions organs, permits independent movement, and provides immune defense via phagocytic cells.

  • What is the function of reticular connective tissue and where is it located?

    Provides a supporting framework.
    Located in liver, kidney, spleen, lymph nodes, and bone marrow.

  • What are the main functions of adipose tissue and where is it commonly found?

    Functions: cushions organs, stores energy, insulates, and reduces heat loss.
    Found deep to skin especially at sides, buttocks, breasts, and around eyes and kidneys.

  • Describe the structure and function of dense regular connective tissue.

    Collagen fibers are parallel and tightly packed.
    Found in tendons and ligaments.
    Function: provides firm attachment, conducts pull of muscles, resists stress in one direction.

  • Where is dense irregular connective tissue found and what is its function?

    Located in capsules of visceral organs, periosteum, perichondrium, nerve and muscle sheaths, and dermis.
    Function: provides strength to resist stress from multiple directions.

  • What are the characteristics and functions of hyaline cartilage?

    Most common cartilage with a firm but flexible matrix containing collagen fibers.
    Located at ends of ribs, fetal skeleton, larynx, trachea, and nose.
    Functions: provides stiff but flexible support and reduces friction.

  • What distinguishes elastic cartilage and where is it found?

    Contains numerous elastic fibers making it resilient and flexible.
    Found in auricle of external ear, epiglottis, auditory canal, and larynx.
    Function: tolerates distortion and returns to original shape.

  • Describe fibrocartilage and its function.

    Contains densely interwoven collagen fibers with little ground substance.
    Located in intervertebral discs, knee joint pads, and pubic symphysis.
    Function: resists compression, absorbs shock, and limits bone-to-bone contact.

  • What are the key features of epithelial cells regarding surfaces and organelles?

    Have apical surface (exposed to lumen or environment) and basal surface (attached to basement membrane).
    Contain cilia or microvilli on apical surface, nucleus, Golgi apparatus, mitochondria, and lateral surfaces.

  • How are simple and stratified epithelia different?

    Simple epithelia have one cell layer with all cells touching basement membrane.
    Stratified epithelia have multiple layers with only the deepest layer touching basement membrane.

  • What are the shapes of epithelial cells and their characteristics?

    Squamous: wider than tall, flat.
    Cuboidal: width equals height.
    Columnar: taller than wide, may be ciliated.
    Pseudostratified: varied shapes, all touch basement membrane but not all reach lumen.

  • Where is stratified squamous epithelium found and what is its function?

    Located on skin surface, lining mouth, throat, esophagus, rectum, anus, and vagina.
    Function: provides physical protection against abrasion, pathogens, and chemical attack.

  • What is the function and location of transitional epithelium?

    Located in urinary bladder, renal pelvis, and ureters.
    Function: permits repeated stretching and recoiling without damage.

  • What are tight junctions and their role in epithelial tissue?

    Connections near the apical surface that fuse cell membranes tightly.
    Prevent passage of substances between cells, maintaining barrier integrity.

  • Describe desmosomes and their function.

    Strong cell-to-cell adhesion structures that resist mechanical stress.
    Function: hold cells together and enable tissues to withstand stretching.

  • What are gap junctions and their purpose?

    Ring-like proteins forming channels between adjacent cells.
    Allow passage of ions, amino acids, glucose, and small molecules for cell communication.

  • Differentiate between exocrine and endocrine glands.

    Exocrine glands secrete products through ducts to body surfaces or organ lumens.
    Endocrine glands secrete hormones directly into the bloodstream without ducts.

  • What are the three methods of secretion in exocrine glands?

    Merocrine: secretion via exocytosis.
    Apocrine: secretion by shedding apical cytoplasm.
    Holocrine: secretion by cell rupture and release of contents.

  • Name the four types of membranes and their functions.

    Mucous membranes: line passages to exterior, secrete mucus.
    Serous membranes: line body cavities, secrete serous fluid.
    Cutaneous membrane: skin, covers body surface.
    Synovial membranes: line joint cavities, secrete synovial fluid.