Body systems

1. takes up oxygen from the air we breathe and expels the unwanted carbon dioxide
5. a blood vessel that carries blood from the heart to tissues and organs in the body
7. delicate blood vessels that exist throughout your body
8. the mechanical breakdown of food
9. chemical substances that act like messenger molecules in the body
10. a blood vessel that carries blood to the heart from tissues and organs in the body.
17. an organ that makes hormones that are released directly into the blood and travel to tissues and organs all over the body
18. a specialized tissue in animals which applies forces to different parts of the body by contraction
19. the adaption of form or behavior of an organism to changed conditions

2. a specialized tissue in animals which applies forces to different parts of the body by contraction
3. the ability of the body to maintain a stable internal environment despite changes in external conditions
4. includes the brain, spinal cord, and a complex network of nerves
6. the systems that excrete wastes from the body
11. an organ that makes one or more substances, such as hormones, digestive juices, sweat, tears, saliva, or milk.
12. they help to control the physical forces within the body
13. the organs that take in food and liquids and break them down
14. occurs to increase the change or output
15. the system that contains the heart and the blood vessels and moves blood throughout the body
16. the tissues, glands, and organs involved in producing offspring