1. Red blood cells
Image: Annie Cavanagh
2. Split end of human hair
Image: Liz Hirst,
3. Purkinje neurons
Image: Annie Cavanagh,
4. Hair cell in the ear
Image: Wellcome Photo Library,
5. Blood vessels emerging from the optic nerve
Image: Freya Mowat,
6. Tongue with taste bud
Image: David Gregory & Debbie Marshall,
7. Tooth plaque
Image: David Gregory & Debbie Marshall,
9. Alveoli in the lung
Image: David Gregory & Debbie Marshall,
10. Lung cancer cells
Image: Anne Weston,
11. Villi of small intestine
Image: Professor Alan Boyde,
12. Human egg with coronal cells
Image: Yorgos Nikas,
13. Sperm on the surface of a human egg
Image: Yorgos Nikas,
15. Human embryo and sperm
Image: Dr. David Becker,
15. Coloured image of a 6 day old human embryo implanting
Image: Yorgos Nikas,