The mammalian gaseous exchange system 0.0 / 5 ? BiologyExchange and transportA2/A-levelOCR Created by: Grace_FlowerdayCreated on: 20-11-19 10:21 69321078415 Across 1. Breathing out (10) 4. Tiny sacs, which are the main exchange surfaces for the body. (7) 5. The result of the divided bronchi (11) 8. They have a high____rate (9) 9. This divides from the trachea and leads to the lungs. Similar to the trachea but smaller than it. (8) 10. The broad domed sheet of muscle that forms the floor of the thorax. (9) Down 2. The substance that supports trachea in the form of wide incomplete rings, to stop the trachea from collapsing. (9) 3. What trachea is lined with (8, 10) 6. Has a hairy lining which secretes mucus and traps dust and mucus, protecting the lung tissue from irritation and infection. (5, 6) 7. The main airway carrying clean, warm, moist air down to the chest from the nose. (7)
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