CIE A Level Biology (9700) 2019-2021

Revision Notes

9.1.1 The Human Gas Exchange System

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.

Author: Jenna

Jenna studied at Cardiff University before training to become a science teacher at the University of Bath specialising in Biology (although she loves teaching all three sciences at GCSE level!). Teaching is her passion, and with 10 years experience teaching across a wide range of specifications – from GCSE and A Level Biology in the UK to IGCSE and IB Biology internationally – she knows what is required to pass those Biology exams.
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