Module 2.3

2. of organs that break down food, absorb its nutrients, and expel any remaining waste. Organs of the digestive ...
3. They gain most of their heat from external sources
4. the system in humans that takes up oxygen and expels carbon dioxide
7. It protects your body from harmful substances, germs and cell changes that could make you ill.
9. a change in a given direction causes additional change in the same direction.
11. those that maintain a constant body temperature independent of the environment.
12. consists of the organs that remove metabolic wastes from the body.
14. consists of the organs and fluids that transport materials throughout the body
15. consists of the tissues that create and release hormones.

1. a normal biological response in which the effects of a reaction slow or stop that reaction.
5. the muscular and skeletal systems work together to support and move the body.
6. a complex network of neurons and cells that carry messages to and from the brain and spinal cord
8. ability to maintain internal stability in an organism in response to the environmental changes.
10. chemical substances that act like messenger molecules in the body.
13. are tissues or organs that excrete chemical substances (hormones) directly into the blood.