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A-Level Biology OCR A

Air Structure Nasal Temp Humidity Dust Surfaces Describe

Front Describe the structure of the nasal cavity & explain how its structure makes it adapted for its function
Back Nasal cavity:
  • Main function: allow air to enter lungs at a similar temp and humidity to the air there & prevent dust particles/pathogens from entering
  • Large SA with good blood supply, warms air to body temp to help maintain it
  • Hairy lining that secretes mucus to trap dust and bacteria protecting lung tissue 
  • Moist surfaces increase humidity of incoming air reducing evaporation from exchange surfaces

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