Unlock your full potential with these revision guides which focus on the key content and skills you need to know. With My Revision Notes for OCR AS Biology you can:.; Take control of your revision: plan and focus on the areas you need to revise with content summaries and commentary from author Franck Sochacki.; Show you fully understand key topics by using the examples to add depth to your knowledge of biological processes and applications.; Apply biological terms accurately with the help of definitions and key words on all topics.; Improve your skills to tackle exam questions, with self-testi.;Cover; Book title; Contents; Unit F211 Cells, exchange and transport; 1 Cell structure; Microscopes; Cells; 2 Cell membranes; The structure of cell membranes; Transport of substances across membranes; 3 Cell division, cell diversity and cellular organisation; Cell division; Stem cells and differentiation; Tissues, organs and organ systems; 4 Exchange surfaces and breathing; Exchange surfaces; The gaseous exchange system; Breathing; 5 Transport in animals; Circulatory systems; The heart; Blood vessels; Transport of oxygen and carbon dioxide; 6 Transport in plants; Xylem and phloem.