Across
- 2. – Red fluid that carries oxygen and nutrients.
- 6. – Main control center of the body.
- 7. – Structure that carries messages in the nervous system.
- 8. – Organ where oxygen enters and carbon dioxide leaves the blood.
Down
- 1. – Hard structure in the mouth used for chewing.
- 2. – Hard structure that supports the body.
- 3. – Substance used to treat or prevent disease.
- 4. – Organ that pumps blood through the body.
- 5. – The smallest unit of life in the human body.