CIE AS Biology

Revision Notes

Syllabus Edition

First teaching 2020

Last exams 2024

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9.1.1 The Human Gas Exchange System

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The Human Gas Exchange System

  • Gas exchange takes place in the human thorax. This is a collection of organs and tissues in the chest cavity

The Human Thorax, downloadable AS & A Level Biology revision notes

The main structures of the human gas exchange system

Thorax structures table

Thorax Structures Table, downloadable AS & A Level Biology revision notes

Exam Tip

Remember to pay attention to command words in exams, as they will be asking different things. For example, a question asking you to “Describe” the structure of the alveoli is different from a question asking you to “Explain” the structure of the alveoli.“Describe” questions are asking you to give an account of something or to write events or processes in a logical order.“Explain” questions are asking you to write why something happens or to link its structure to its function – as a result of this, “because” will be an important part of your answer.

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Lára

Author: Lára

Lára graduated from Oxford University in Biological Sciences and has now been a science tutor working in the UK for several years. Lára has a particular interest in the area of infectious disease and epidemiology, and enjoys creating original educational materials that develop confidence and facilitate learning.