Puzzle Development

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Across
  1. 1. Main muscle responsible for breathing
  2. 4. Tube that transports urine from the kidneys to the bladder
  3. 5. Muscular tube that carries food from the throat to the stomach
  4. 7. Tiny air sacs in the lungs where gas exchange occurs
  5. 8. Tiny finger like structures in the small intestine that absorb nutrients
  6. 9. First section of the small intestine
  7. 10. Two major air passages that branch from the trachea
  8. 13. Tube that carries urine out of the body
  9. 14. Organ that produces insulin and digestive enzymes
Down
  1. 2. Network of tiny blood vessels that filters blood in the kidney
  2. 3. Wave like muscle contractions that move food through the digestive tract
  3. 5. Flap that prevents food from entering the windpipe
  4. 6. Upper chamber of the heart that receives blood
  5. 11. Functional unit of the kidney that filters blood and produces urine
  6. 12. Windpipe that carries air to and from the lungs