Read Section 4 – Exchange from the CGP Head Start to A-level guide.

This section covers:

• Size and surface area to volume ratio
• Structure of the thorax
• Breathing in and breathing out

Tasks:

1. Make your own summary notes from this content and learn all the key points.

2. Complete the quick questions and exam questions (1st document), then assess your answers (2nd document). You may need to do some additional online research to help you address some more challenging parts of the exam question.