Organs and organ system

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Across
  1. 2. to measure blod pressure
  2. 6. A muscular partition present at the base of thoracic cage.
  3. 7. trachea>bronchus>bronchiole>.............
  4. 8. provides immunity by fighting bacteria entering the body
  5. 9. blood group O is the 'universal...................'
Down
  1. 1. Circulatory system:.............Respiratory system:Lungs
  2. 3. thick walled,carry oxygenated blood and have no valves
  3. 4. bone marrow Production of RBCs occurs in
  4. 5. the pigment present in RBC