Across
- 5. consists of organs used for gas exchange
- 6. internal framework of the human body
- 9. maintains a stable internal environment despite changes in the external environment
- 10. vessels that carry oxygen-rich blood from the heart to organs
- 12. organs that take in and break down food and liquids
- 13. an organ that creates and releases one or more substances
- 14. vessels that collect oxygen-poor blood and return it to your heart
- 17. glands and organs that make and release hormones
- 18. involved in producing offspring
- 19. removes unnecessary materials from the body fluids
- 20. smallest blood vessels in vascular system
Down
- 1. consists of a single muscle cell
- 2. moves blood throughout the body
- 3. permits movement and maintains posture in the body
- 4. chemical substances that act like messenger molecules
- 7. amplifying the change or output
- 8. includes the brain, spinal cord, and transmits signals
- 11. reduces the change or output
- 15. composed of cells that can shorten or contract
- 16. maintain internal stability while adjusting to changing external conditions