puzzle up 2

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Across
  1. 5. smallest blood vessels
  2. 6. this is called the triple vaccine
  3. 7. ______ vein brings clean blood from the lungs into the heart
  4. 9. the heart makes audible sounds due to the closure of
  5. 10. the first discovered organelle
Down
  1. 1. part of human eye controls the amount of light entering the eye
  2. 2. the branch of medicine involving synthetic chemical compounds
  3. 3. name of sugar found in milk
  4. 4. number of eyes found in earthworm
  5. 8. organ system in which the brain is a part is _______ system