Respiratory System
Structure
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1: (b) Gills, 2: (a) Pharynx → Larynx → Trachea, 3: (c) Pharynx, 4: (d) Double membrane covering the lungs, 5: (d) Pharynx, Larynx, Bronchi and Terminal Bronchioles, 6: (a) Alveoli and their ducts, 7: (c) Sternum, ribs, diaphragm and vertebral column, 8: (a) Rhinitis, 9: (c) Laryngitis, 10: (b) Lungs