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Biological Levels of Organization. http://player.discoveryeducation.com/index.cfm?guidAssetId=D601FCE2-B6F4-446E-8763-A1B9A9BA86C7 Cell – basic unit of structure and function Organelles – structures in the cell that perform specific functions Groups of cells form tissues .

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biological levels of organization
Biological Levels of Organization

http://player.discoveryeducation.com/index.cfm?guidAssetId=D601FCE2-B6F4-446E-8763-A1B9A9BA86C7

  • Cell – basic unit of structure and function
    • Organelles – structures in the cell that perform specific functions
  • Groups of cells form tissues.
  • Groups of different tissues form organs.
  • Groups of different organs working together form organ systems.
  • Organ systems make up an organism.
organization of the human body
Organization of the Human Body:
  • Body cavities
  • Layers of membranes within body cavities
  • Organ systems
1 body cavities
1. Body Cavities
  • Axial portion – head, neck, and trunk
  • Appendicular portion – upper and lower limbs (“append” = to hang)
  • Axial portion:
    • Dorsal cavity (“dors” = back)
    • Ventral cavity
  • Dorsal cavity:
    • Cranial cavity (“cran” = helmet)
    • Vertebral canal
1 body cavities cont
1. Body Cavities (cont.)
  • Ventral cavity:
    • Thoracic cavity
    • Abdominopelvic cavity
  • Thoracic cavity:
    • Thoracic and abdominopelvic cavities are separated by the diaphragm.
    • Mediastinum
      • A region that separates the thoracic cavity into 2 compartments containing the right and left lungs
      • All other thoracic viscera (organs) are in the mediastinum.
1 body cavities cont1
1. Body Cavities (cont.)
  • Abdominopelvic cavity:
    • Abdominal cavity – contains stomach, spleen, liver, gallbladder, kidneys, and most of the small and large intestines
    • Pelvic cavity (“pelv” = basin) – contains the terminal portion of the large intestine, urinary bladder, and internal reproductive organs.
  • Smaller cavities in the head:
    • Oral cavity
    • Nasal cavity
    • Orbital cavities
    • Middle ear cavities
1 body cavities summary
1. Body Cavities Summary
  • Appendicular portion
    • Upper limbs
    • Lower limbs
  • Axial portion
    • Dorsal cavity
      • Vertebral canal
      • Cranial cavity
        • Oral cavity
        • Nasal cavity
        • Orbital cavities
        • Middle ear cavities
1 body cavities summary cont
1. Body Cavities Summary (cont.)
  • Ventral cavity
    • Thoracic cavity
      • Mediastinum
      • Right lung
      • Left lung
    • Abdominopelvic cavity
      • Abdominal cavity
      • Pelvic cavity