Across
- 2. bone protecting inner organs
- 7. fibres transmitting impulses in the body
- 10. this consists of conjugated proteins
- 11. vessel which carries blood to the heart
- 12. muscles are made mostly of this
Down
- 1. sore in the stomach caused by severe acidosis
- 3. substances help digestion in the mouth
- 4. organ for breathing
- 5. protective layer covering of the body
- 6. organ that pumps blood
- 8. organ which cleans blood
- 9. hard substance making up the skeleton