Human Tissues

Human Tissues

1. Tissues: A group of cells that have a similar structure and act together to perform a specific function

2. 1. Epithelial

   • General Characteristics: - Having a little extracellular matrix between closely packed cells - Are Avscular - Have a nerve suplply - High capacity for cell division
   • Types, functions, location, photos - Covering and lining epithelium - Glandular Epithelium -Squamous: thin/flat - Cuboidal: cubes/ hexagons - Columnar: In columns, longer than wide - Transitional: change shape from flat to cuboidal -

3. 2. Connective

   • Most Abundant tissue type: typically found between other tissues. The different functions depend on the form.
   • Fibroblasts: Secrete fibers and ground substance, Macrophages: Formed from white blood cells, Plasma Cells: Make antibodies, important in immune response, Mast Cells: Produce Hystamine and kills bacteria, Adipocytes: Store tryglycerides
   • Classifications of Connective Tissue: Loose Areolar: widely distributed throughout the body. Loose Adipose: Found wherever loose areolar is found. Loose Reticular: Consists of fine, interlacing reticular fibers and cells. Dense Regular: Bundles of regularly arranged parallel collagen fibers. Dense Irregular: Bundles of irregularly arranged parallel collagen fibers. Dense Elastic: Made predominantly of branching elastic fibers
   • Types of Cartilage: Fibrocartilage: fibers visible, Elastic: chondrocytes in the threadlike elastic network, Hyaline: appears clear because fibers are not easily visible

4. 4. Nervous

   • The function of Nervous tissue is conduct nerve impulses
   • Types of Cells: Neurons: convert stimuli into nerve impulses and conduct them, Neuroglia: do not generate nerve impulses but serve supportive functions

5. 3. Muscular

   • Three Types: Skeletal Muscle: pulls on the bones allowing movement Cardiac Muscle: forms wall of heart, pumps blood through blood vessels Smooth Muscle: found in walls of hollow organs.

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