Across
- 10. messenger system in an organism
- 11. internal stability while adjusting to change external conditions
- 12. single muscle cell
- 15. mechanical breakdown of food
- 16. organ that makes one or more substance
- 17. chemical substances that act like messenger molecules in the body
- 19. physically breaking down of substances
- 20. takes up oxygen from the air we breathe
Down
- 1. product of reaction leads to an increase in the reaction
- 2. body can self- regulate
- 3. cells that have the ability shorten/contract movement
- 4. removes excess and waste products from the body
- 5. effects of a reaction slow or stop the reaction
- 6. transmits signals to and from the parts of the body
- 7. take in food and liquids/break them down
- 8. biological occurrence where an output of a system amplifies the system
- 9. permits movement of the body, maintains posture, and circulates blood.
- 13. contains heart and blood vessels
- 14. type of blood vessel
- 18. bones that structure the human body