Body Systems and Homeostasis

6. Mechanical digestion involves physically breaking down food substances into smaller particles to more efficiently undergo chemical digestion.
10. Takes up oxygen from the air we breathe and expels the unwanted carbon dioxide.
11. The system that contains the heart and the blood vessels and moves blood throughout the body.
15. A self-regulating process by which an organism can maintain internal stability while adjusting to changing external conditions.
16. The organs that take in food and liquids and break them down into substances that the body can use for energy, growth, and tissue repair.
17. Your body's support structure.
19. Composed of cells that have the special ability to shorten or contract in order to produce movement of the body parts.
20. The tissues, glands, and organs involved in producing offspring (children).

1. The glands and organs that make hormones and release them directly into the blood so they can travel to tissues and organs all over the body.
2. An organ system responsible for providing strength, keeping up the balance, maintaining posture, allowing movement, and producing heat.
3. An organ that makes one or more substances, such as hormones, digestive juices, sweat, tears, saliva, or milk.
4. Blood vessels located throughout your body that collect oxygen-poor blood and return it to your heart.
5. Consist of a single muscle cell.
7. Delicate blood vessels that exist throughout your body.
8. A vital biological system that removes excess and waste products from the body to maintain homeostasis.
9. Chemical substances that act like messenger molecules in the body.
12. An organism's control center.
13. A blood vessel that carries blood from the heart to tissues and organs in the body.
14. The human body self-regulates to maintain a stable internal environment despite changes in the external environment.
18. An organization of varying numbers and kinds of organs so arranged that together they can perform complex functions for the body.