1. Red blood cells
2. Split end of human hair
3. Purkinje neurons
4. Hair cell in the ear
5. Blood vessels emerging from the optic nerve
6. Tongue with taste bud
7. Tooth plaque
8. Blood clot
9. Alveoli in the lung
10. Lung cancer cells
11. Villi of small intestine
12. Human egg with coronal cells
13. Sperm on the surface of a human egg
14. Human embryo and sperm
