Hierarchical organization of interacting systems in a human body

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Across
  1. 5. Example heart, arteries, capillaries, veins, blood, white blood cells.
  2. 7. Removes waste products from the body.
  3. 8. The mechanism of the body to maintain the levels of hormones in the body in the desired limits.
  4. 11. Breaks down food to give the body energy.
  5. 12. These act like "wires" sending signals around our body.
Down
  1. 1. A chemical substances that act like messenger molecules in the body.
  2. 2. Works with the skeletal system to allow the body to move.
  3. 3. The tendency to resist change in order to maintain a stable, relatively constant internal environment.
  4. 4. Example mouth, esophagus, stomach, liver, pancreas, small intestine, large intestine etc.
  5. 6. Produces chemicals (hormones) that control many of the body's functions.
  6. 9. A group of people or things arranged in order of rank or the people that rank at the top of such a system.
  7. 10. Carry oxygen-poor blood back to the heart.