Human Body System

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Across
  1. 3. groups of cells that have a similar structure and act together to perform a specific function
  2. 4. are extensions of the windpipe
  3. 7. system water in the body and filters and eliminates
  4. 9. is a wide, hollow tube
  5. 11. smallest of the body's blood vessels
  6. 12. pair of organs in the abdominal cavity of mammals, birds, and reptiles
  7. 14. tiny balloon-shaped air sacs
  8. 15. blood cell protecting the body against both infectious diseases
Down
  1. 1. a major part of the digestion of food occurs
  2. 2. contains many different types of cell
  3. 5. system network consisting of blood
  4. 6. Each of your kidneys is made up of
  5. 8. thin skeletal muscle that sits at the base of the chest
  6. 10. A chamber of the heart
  7. 13. help by increasing the surface area the intestine has for absorption.