Structural Organization

• Chemical level


  The lowest level of organization.
• Atoms


  Composes all chemicals necessary for maintaining life.
• Molecules


  are formed by atoms joined in various ways.
• Cells


  Various chemicals in the form of molecules are organized to form cells.
• Cells


  The basic structural and functional unit of all living tissue.

  (muscle, bone, cartilage, fat, nerve, skin, or blood)
• Tissues


  are cohesive groups of similar cells that, together with their intercellular material, perform a specific function.
• Four (4) basic types of tissue

  1. Epithelial
  2. Connective
  3. Muscular
  4. Nervous
• Epithelial

  • Cover internal and external surfaces of the body.
  • Lining of vessels and organs (stomach and intestines)
• Connective


  Supportive tissues that bind together and support various structures.

  (ligaments, tendons)
• Muscular


  tissues that make up the substance of a muscle
• Nervous


  tissues that make up the substance of nerves and nerve centers.

  (DOES NOT REGENERATE)
• Organs


  Complex assemblies of tissues that are joined to perform a specific function.
• Organs usually have a

  Specific shape
• Main organs of the human body

  • Kidneys
  • Heart
  • Liver
  • Lungs
  • Stomach
  • Brain
• System


  consists of a group or an association of organs that have a similar or common function.
• The total body comprises...

  10 individual body systems.
• Organism


  The 10 systems of the body when functioning together make up the total organism.