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A-Level Biology OCR A

Air Structure Nasal Temp Humidity Dust Surfaces Describe

The nasal cavity warms, humidifies, and filters air using its large surface area, rich blood supply, mucus-secreting hairy lining, and moist surfaces.

The nasal cavity warms, humidifies, and filters incoming air using its large surface area, good blood supply, hairy lining secreting mucus, and moist surfaces.

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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