Tissues, Organs,

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Tissues, Organs, Systems

• Please follow along in your Resource Books!

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Definitions

• TISSUE groups of cells of a similar structure
  which perform specialized functions (examples
  muscle tissue, connective tissue, bone tissue)
• ORGANS groups of similar tissues organized into
  recognizable units (examples heart, kidney,
  liver)
• SYSTEMS a collection of tissues organs that
  work together to perform a specific uniformed
  function (examples digestive system, nervous
  system, circulatory system)

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EPITHELIUM THE COVERING TISSUE

• cells may be thin flat, tall columnar, or any
  shape in between
• may be a single layer or up to several layers of
  cells
• functions of a covering lining tissue

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Function of Epithelium

• covers the exposed surfaces of the body the
  skin, the eyes, the lips
• lines the cavities, tracts, vessels, ducts in
  the interior of the body (lines the digestive
  tract, the blood vessels, the abdominal chest
  cavities, the ducts of glands, as well as making
  up the secretory cells of glands)

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CONNECTIVE SUPPORTING TISSUE

• These tissues are characterized by the large
  amount of extracellular, or nonliving, materials
  they contain.
• Connective tissue
• Bones cartilage tissue
• Fat tissue

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Connective Tissue

• composed mainly of the protein collagen
• Overlapping tissues form a fabric-like
  consistency that is very tough and durable
• Elastic fibers within tissue make it very
  flexible and elastic
• Binds cells to cells, cells to tissues, tissues
  to organs, and just about everything else!

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Bone Cartilage Tissue

• Living tissue composed of calcium and phosphorus
  compounds
• Rigid, strong, and tough

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FAT TISSUE

• Composed of specialized cells that each take up
  store fat as a single globule within the interior
  of each cell
• Found under skin much of it is found in about
  internal organs

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Muscle The Contracting Tissue

• Striated muscle
• Moves the body parts
• Composed of bundles of long, thin, cylindrical
  fibers arranged parallel to one another
• A.K.A skeletal muscle
• Smooth muscle
• Found in the internal organs blood vessels
• Unstriated muscle
• Long, spindle-shaped cells
• Cardiac muscle
• Found only in the heart
• Cell size and shape is intermediate between
  striated and smooth

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The Conducting Tissue

• Nerve cells (neurons)
• Three parts of nerve cells are cell body,
  dendrites, and axons