Across
- 4. cell organelle that makes energy (ATP)
- 6. gland that secretes hormones
- 7. an ion that controls membrane potential
- 9. part of a nerve cell
Down
- 1. muscle tissue that moves the skeleton
- 2. cells becoming specialised to form tissues
- 3. a type of epithelial cell
- 5. tissue type that transports material
- 8. the smallest living thing