Human Body Systems

3. A body system that protects against infection and maintains a healthy balance of fluids in your body.
5. The limbs of the skeleton the ike humerus and femur bones.
8. The skull and vertebral column of the skeleton.
10. A body system that includes the gastrointestinal tract which breaks down food to be absorbed.
11. Type of cell that sends messages and receives stimuli.
12. Processes that maintain the body's equilibrium.
14. The system which circulates blood and lymph.
15. Special tissues that create and excrete substances into the bloodstream.

1. Chemical messengers that relay signals from one neuron to another.
2. A body system that fights against pathogens that enter the body.
4. A body system that consists of the brain, spinal cord, and nerves to relay sensory information.
6. A body system that contains the body's largest organ and protects the organs inside the body.
7. A body system that brings oxygen into the body to be circulated in the blood and then expels carbon dioxide.
9. A body system that produces hormones that regulate the body's organs and cell activities.
13. A body system that consists of skeletal, smooth, and cardiac which permits movement of the body.