• The human body is organized at different levels, starting with the cell and ending with the entire organism.
  • At each higher level of organization, there is a greater degree of complexity.
  • There are four basic types of human tissues: epithelial, muscle, nervous, and connective tissues.
  • An organ is a structure that consists of two or more types of tissues that work together to do the same job.
  • Examples of human organs include the brain, heart, lungs, skin, and kidneys.
  • Your body’s 12 organ systems are shown below (Table below)
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