GetBodySmart
Superb interactive, illustrated tutorials and quizzes on human anatomy and physiology. This is definitely worth a visit if you are studying the human body.
LessonSense.com
Lots of teaching resources set around themes. There are craft ideas, worksheets, lesson plans and games. The site hasn't been updated for a while but the ideas are archived.
Key Stage 3 Bitesize - Biology
Learn key points and test your knowledge on the main topics which include Living Organisms, Nutrition, Digestion and Excretion, Respiration and Gas Exchange, Health and Diseases, Reproduction, Ecosystems and Habitats, and more.
Homeostasis - The Kidneys and Water Balance
An excellent interactive site which explains the structure and function of the kidneys. It also looks at how kidneys work, at problems which can arise and at dialysis.
Galaxy Pugs
Galaxy Pugs is a Key Stage 1 science game features missions where children learn about plants, animals, materials, the human body, habitats and micro habitats.
Bad Human Factors Designs
A scrapbook of illustrated examples of things that are hard to use because they do not follow human factors (also known as ergonomics) principles. The site examines why objects are poorly designed and suggests solutions.
Breathing
A simple animation to show muscle and diaphragm action for breathing in and out in the human body.
BioTopics
Do you need information for your GCSE Biology or Double Award Science? If so, you will probably find it here, where there is practically a whole set of illustrated teaching notes.
Skin Structure and Function
An excellent, interactive about the structure and functions of skin. It also looks at common skin infections.
Discovering DNA - A Recipe for Life
A teacher resource detailing a workshop through which children can discover a basic understanding of the role of DNA within cells of the human body and an appreciation of how their unique DNA makes them different to other people.