body systems

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Across
  1. 1. a fluid that helps soften food so that it can be swallowed more easily
  2. 5. microscopic air sacs
  3. 6. a structure that filters and destroys pathogens
  4. 7. is the oil produced by sebaceous glands
  5. 8. tube that allows urine to pass through the body
  6. 10. is a thin tissue that covers bone and contains nerves and blood vessels
  7. 12. a protein that helps regulate chemical reactions
  8. 13. an elongated fiber that carries impulses away from the cell body to the dendrites of another neuron
  9. 14. small fold in the lining of the small intestine that increase the surface area and allow more food to be absorbed
Down
  1. 2. a hormone that regulates blood sugar levels
  2. 3. the part of the brain that controls and coordinates muscle activity
  3. 4. the liquid component of blood that carries blood cells and dissolved materials
  4. 8. a pale yellow liquid composed of water salts and other waste products
  5. 9. two tubes through which air moves to the lungs
  6. 10. a dome shaped lesion that contains pus consisting of white blood cells, dead skin cells and bacteria
  7. 11. tough tissue fiber that attaches muscles to bone