Respiratory and circulatory system appetizer

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Across
  1. 4. occurs when blood supply to the brain is blocked causing brain cells to die.
  2. 6. is four chambered and consists of 2 atria and ventricles
  3. 7. contains vocal cords that vibrate to make sound.
  4. 8. What is a Dome-Shaped muscle under the lungs.
  5. 9. carry blood away from the heart
Down
  1. 1. carry blood toward the heart.
  2. 2. branches into 2 tubes.
  3. 3. The main function is to supply oxygen and nutrients to tissue and remove waste products like carbon dioxide.
  4. 5. passage way for air from larynx to lungs.
  5. 7. Two large sponge like organs that contain bronchi, bronchioles and alveoli.