Human Body Systems

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Across
  1. 1. the process by which your body breaks down food into small nutrient molecules
  2. 7. tiny vessel where substances are exchanged between the blood and body cells
  3. 9. substances in food that provide the raw materials the body's cells need to carry out all their essential processes
  4. 10. the reaction of a person's body by potentially threatening, challenging, or disturbing events
  5. 12. tiny thin walled sacs of lung tissue where gases can move between air and blood
  6. 14. protein that speed up chemical reactions in the body
Down
  1. 2. any change or signal in the environment that can make an organism react in soom way
  2. 3. waves of smooth muscle contractions that move food through the esophagus toward the stomach
  3. 4. chemical produced by an endocrine gland
  4. 5. a cell that carries information through the nervous system
  5. 6. the junction where one neuron can transfer an impulse to another neuron
  6. 8. two passages that direct air into the lungs
  7. 11. an action or change in behavior that occurs as a result of a stimulus
  8. 13. fluid inside the lymphatic system