Mechanisms of ventilation and gaseous exchange in fish and insects
A series of approaches to cover these re-introduced topics in the new AS-level Biology A course.
It looks at:
1. understanding key terms and how a unidirectional flow of water is maintained over the gills.
2. explaining why a countercurrent flow is more efficient at exchanging oxygen in fish than a concurrent flow.
3. suggests dissection activities to examine the gas exchange system of a bony fish and/or insect trachea.
4. the ventilation system in insects explaining how they are adapted for efficient gas exchange.


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  • Mechanisms-of-ventilation-and-gaseous-exchange.pdf
  • Learner-sheets.doc

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Created: Oct 9, 2015

Updated: Feb 22, 2018

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pdf, 885 KB



doc, 136 KB


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Creative Commons "Sharealike"