Topic 3.2: Gas exchange (AQA A-level Biology)

This bundle contains 4 lessons which cover the following content that’s set out in topic 3.2 (Gas exchange) of the AQA A-level Biology specification:

• Adaptations of gas exchange surfaces as shown by the gas exchange in single-celled organisms, insects, bony fish and the leaves of dicotyledonous plants
• The gross structure of the human gas exchange system
• The essential features of the alveolar epithelium as a surface over which gas exchange takes place
• The mechanism of breathing

All of the lessons are detailed and have been intricately planned to contain a wide range of tasks that will challenge the students on their understanding of the current topic as well as their recall of knowledge from previously-covered topics. In this way, the students are encouraged to make links between biological processes in different topics so they are prepared for assessment questions which do just that.

Lessons covering topics 3.1, 3.3 and 3.4 are also uploaded