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