Biology A-Level
spiracles and valves
What spiracles and valves means in Biology A-Level, as defined for AQA.
Definition of spiracles and valves
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Reference: AQA
Structures that can close via valves and have hairs that trap moist air, reducing the water potential gradient.
Topics that use spiracles and valves
- Gas exchange (AQA A-Level)
Related terms
- antagonistic intercostal muscles
- Bronchioles
- Correlation
- counter-current flow
- diffusion at the alveolus
- large surface area
- Lungs
- maintaining a concentration gradient
Using spiracles and valves in the exam
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