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Body Tissues

Body Tissues. Tissue. Group of cells that are similar in structure and function Four Primary Types Epithelium - covering Connective Tissue - support Nervous Tissue - control Muscle - movement. Epithelial Tissue or Epithelium. Lining, covering, and glandular tissue of the body

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Body Tissues

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  1. Body Tissues

  2. Tissue • Group of cells that are similar in structure and function • Four Primary Types • Epithelium - covering • Connective Tissue - support • Nervous Tissue - control • Muscle - movement

  3. Epithelial Tissue or Epithelium • Lining, covering, and glandular tissue of the body • Main functions include protection, absorption, filtration, and secretion

  4. Special Characteristics • Fit closely together to form continuous sheets • Have a free (unattached) surface – apical surface • Lower surface rests on the basement membrane • Have no blood supply of their own (known as avascular) and depend on diffusion from the capillaries for food and oxygen • If well nourished, they can regenerate themselves easily

  5. Classification of Epithelium • Classification use the combination of the following terms (except glandular): • Simple – one layered (absorption, secretion, and filtration) • Stratified – more than one layer (protection) • Squamous – flattened • Cuboidal – cube shaped • Columnar – column shaped • (Stratified are named for the cells at the free surface)

  6. Connective Tissue • Connects body parts • Involved in protecting, supporting, and bindingtogether other body parts • Common Characteristics: • Vary in blood supply – types with low blood supply take a long time to repair itself • Extracellular matrix – made up of many different types of cells plus nonliving substances

  7. Muscle Tissue • Highly specialized to contract (shorten) to provide movement Nervous Tissue • Two major functions are irritability and conductivity

  8. Homework • Day 1 – Aging Paper • Day 2 – Book Work • Page 105: 17, 19, 21, 23, 25, 27 (17-27, odd)

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