Exchange Surfaces and Breathing 5.0 / 5 based on 1 rating ? BiologyExchange and TransportA2/A-levelOCR Created by: maddiecorfieldCreated on: 02-01-17 16:41 4321 Across 1. How does air move along the trachae and tracheoles? (9) Down 2. What part of the insect is in charge of gas exchange? (10) 3. What is the site of mammalian gas exchange? (5) 4. Where are internal and external intercostal muscles found? (2, 7, 3, 4)
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