The mammalian breathing system efficiently moves air into the lungs by opening the mouth and lowering the floor, drawing water in due to decreased pressure. Closing the mouth and raising the floor increases mouth pressure, forcing water over the gills.
The mammalian breathing system efficiently moves air into the lungs by opening the mouth and lowering the floor, drawing water in due to decreased pressure. Closing the mouth and raising the floor increases mouth pressure, forcing water over the gills.
| Front | Describe and explain how the structure of the mammalian breathing system enables efficient uptake of oxygen into the blood ( 6 marks) |
|---|---|
| Back | 1. mouth opens, operculum/opercular valve shuts; 2. floor of mouth lowered; 3. water enters due to decreased pressure / increased volume; 4. mouth closes, operculum/opercular valve opens; 5. floor raised results in increased pressure / decreased volume; 6. high/increased pressure forces/pushes water over gills; |
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