The human body systems

2. Your body's central framework.
6. Involve breathing in oxygen and removing carbon dioxide.
8. It permits movement of the body, maintains posture, and circulates blood throughout the body.
10. Your body's outer layer.
11. 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.
12. 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.

1. Transport materials to and from cells.
3. A body system that removes excess, unnecessary materials from the body fluids of an organism.
4. The tissues and organs that produce, store, and carry white blood cells that fight infections and other diseases.
5. Involved in producing offspring.
7. A complex network of cells, tissues, organs, and the substances they make that helps the body fight infections and other diseases.
9. The system sends messages back and forth between the brain and the body. The brain is what controls all the body's functions.