6. The brain and eye

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Dr Alex Lathbridge guides you through the most important GCSE Biology facts, with a few jokes thrown in too. In this sixth episode of our series all about homeostasis and response, Dr Alex Lathbridge breaks down the key facts about the structure of the brain and the eyes. He looks at how the pupils change shape in dim or bright light, and how the lens changes shape to focus on near or distant objects. Take a look on the BBC Bitesize website to find out more about this topic, with revision notes, quizzes and exam-style questions: https://www.bbc.co.uk/bitesize/guides/zprxy4j/revision/5 and https://www.bbc.co.uk/bitesize/guides/zprxy4j/revision/7 Single science AQA Eduqas Edexcel OCR 21st Century OCR Gateway