뒤로Anatomy & Physiology: Tissue Types and Characteristics
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A tissue is a group of similar cells working together to perform a specific function, forming part of an organ and contributing to the whole body's function.
The four basic tissue types are epithelial, connective, muscular, and nervous tissues, each differing in cell types, structure, and function.
Example: Simple squamous epithelium found lining blood vessels and alveoli in the lungs, facilitating diffusion.
Example: Areolar connective tissue found beneath the skin and around organs, providing support and cushioning.
Example: Skeletal muscle tissue attached to bones, enabling voluntary movement.
Example: Nervous tissue found in the brain, spinal cord, and nerves, responsible for transmitting signals.
Cell junctions hold cells tightly in epithelial and some muscle tissues, while the matrix holds cells together in connective tissues.
Tight junctions prevent leakage between cells; found in epithelial tissues like the intestinal lining to control substance passage.
Desmosomes provide strong adhesion between cells; common in skin epithelium to resist mechanical stress.
The matrix is the non-cellular component surrounding cells in connective tissue, composed of fibers and ground substance, providing structural support.
The matrix can be solid (bone), gel-like (cartilage), or liquid (blood), depending on tissue type.
Fibers include collagen (strength), elastic (stretch), and reticular (support network), each aiding tissue function.
Epithelial tissue has tightly packed cells, avascularity, high regeneration, a basement membrane, and covers body surfaces or lines cavities.
Named by cell layers (simple or stratified) and cell shape (squamous, cuboidal, columnar).
The apical surface faces the body surface or lumen for absorption/secretion; the basal surface attaches to the basement membrane for support.
Endocrine glands secrete hormones into blood; exocrine glands release substances via ducts to surfaces (e.g., sweat glands).
Connective tissue has diverse cell types, abundant matrix with fibers, vascularity varies, supports and connects other tissues.
Epithelial tissues have tightly packed cells with little matrix and are avascular; connective tissues have fewer cells, abundant matrix, and usually vascular.
Skeletal muscle is voluntary, striated, multinucleated, attached to bones, highly vascular, and regenerates poorly.
Muscle tissue exhibits excitability, contractility, extensibility, and elasticity to generate movement and force.
Nervous tissue contains neurons and glial cells, transmits electrical signals, is vascular, and has limited regeneration.
Membranes are organs composed of epithelial and connective tissues; types include mucous, serous, cutaneous, and synovial.
Regeneration restores normal tissue; fibrosis replaces tissue with scar tissue, affecting function.
Skin and liver regenerate well; cardiac muscle and nervous tissue regenerate poorly, often replaced by fibrosis.