Homeostasis and Body Systems

2. a detectable change in the internal or external environment.
3. the structural and functional unit of the kidney
4. is a molecule that is acted upon by an enzyme
6. absorbs nutrients in the food
7. receives chemical signals from outside the cell
9. the process of taking in substances
11. carries a signal from one nerve cell to another
15. the ability of an organism or cell to maintain internal equilibrium
16. the process of breaking down food
19. a natural substance that is produced in the body and that influences the way the body grows or develops

1. the narrow, winding, upper part of the intestine where digestion is completed and nutrients are absorbed by the blood
5. a loop system in which the system responds to positive feedback or negative feedback
8. organs whose function is to remove carbon dioxide from the blood and provide it with oxygen
10. a hormone produced in the pancreas that regulates the amount of glucose in the blood
12. a reaction to stimulus
13. is made up cells that work together to perform a specific function
14. a sac in the lungs where the exchange of oxygen and carbon dioxide takes place
17. a large protein which speeds up chemical reactions
18. a nerve cell
20. is made up of tissues to perform a specific function