Crossword practice

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Across
  1. 4. : air sacs at the end of bronchioles in the lungs where exchange of gases between the blood and the lungs takes place
  2. 7. : The organs in the human respiratory system that enable the exchange of gases between the body and the surroundings.
Down
  1. 1. : A component of blood. They are cell fragments that help in clotting of blood
  2. 2. : the muscle in the human respiratory system that separates the chest from the abdomen.
  3. 3. : A muscular organ in the human blood circulatory system that pumps blood around the body
  4. 5. air : the air that we breathe in
  5. 6. : smaller tubes that branch off from each bronchus in the human respiratory system. At the end of the bronchioles are air sacs called alveoli.