Across
- 5. chemical substances that act as messenger molecules in the body
- 7. organs that remove metabolic wastes from the body
- 10. organized network of nerve tissue in the body.
- 13. breaks down food into nutrients such as carbohydrates, fats and proteins for energy
- 15. delicate blood vessels that exist throughout the body
- 16. uses acids and enzymes to break down the food into simpler nutrients to be used by cells
- 17. framework of the body, consisting of bones and connective tissues
- 18. tissues, glands, and organs involved in producing offspring
- 19. the breakdown of food into smaller pieces without chemical change to the molecules
- 20. state of balance among all the body systems
Down
- 1. produce and release different hormones/substances
- 2. network of organs and tissues that help you breathe
- 3. composed of cells that have the special ability to shorten or contract to produce movement
- 4. composed of specialized cells called muscle fibers
- 6. blood vessel that carries blood from the heart to the rest of the body
- 8. type of blood vessels that return deoxygenated blood from your organs back to your heart
- 9. portion of the system's output is used as input for future operations
- 11. glands and organs that make hormones and release them directly into the blood
- 12. contains the heart and the blood vessels and moves blood throughout the body
- 14. consist of a single muscle cell