Tiny sacs within the lungs which increase the surface available for gas exchange amylase
2. a digestive enzyme that breaks down starches and glycogen into sugars bronchi
3. the two thin-walled chambers that receive blood into the heart from the veins atria
4. the two tubes into which the trachea divide to go into each lung ganglia
5. a tiny vessel through which diffusion takes place between the blood and the body tissues capillary
6. a mass of nerve tissue not part of the brain alveoli

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