Crossword puzzle for knowledge of words from units 1-15.

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Across
  1. 2. A unit of mass equal to one millionth of a gram.
  2. 4. A naturally occurring element necessary for the functioning of the human body and absorbed into the bloodstream by the respiratory system.
  3. 9. A unit of mass equal to one thousandth of a gram.
  4. 11. An open wound caused by а hard impact to soft of body tissue.
  5. 13. A doctor who takes X-rays and examines them.
  6. 15. A unit of weight equal to 1/16 of a pound.
  7. 16. A face clothing that protects against microorganisms and viruses.
  8. 17. To breathe in or take air into the lungs.
  9. 19. A blood vessel that carries blood to the heart.
  10. 20. The front part of the head.
Down
  1. 1. The hospital department where doctors perform operations on people.
  2. 3. A unit of mass equal to one-thousandth of a kilogram.
  3. 5. A medical professional who helps a doctor and cares for patients.
  4. 6. A doctor that takes care of children.
  5. 7. An injury, such as a cut or burn.
  6. 8. The organ which pumps blood through the body.
  7. 10. The organ located in the chest and introduces oxygen to the bloodstream.
  8. 12. The part of the face located between the hairline and the eyebrows.
  9. 14. The abbreviation "T".
  10. 18. The organ that located on the face and detects smell.