Biology - Respiration

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Across
  1. 1. where does respiration take place?
  2. 3. the process of breaking down food.
  3. 5. where does respiration happen?
  4. 11. what kind of respiration occurs in yeast?
  5. 13. during exercise, what happens to the rate of breathing in humans?
  6. 14. The alveoli have a ... surface area.
Down
  1. 1. what is the product of aerobic respiration?
  2. 2. what happens to the gas when oxygen passes into the blood and carbon dioxide passes out of the blood?
  3. 4. how many type of respiration are there?
  4. 6. what happens when the external intercostal muscles contract and the ribcage is pulled upwards and inwards?
  5. 7. through what organ does air move into the lungs?
  6. 8. what are the tiny air sacs in the lungs called?
  7. 9. what happens if the diaphragm relaxes and moves downwards?
  8. 10. which type of respiration does not require oxygen?
  9. 12. what does the trachea divide into?