Homeostasis (Pray)

1. the process by which some organisms are able to capture light energy and use it to make food from carbon dioxide and water
4. the process of obtaining oxygen from the environment and releasing carbon
8. a molecule found on the outer surfaces of cells that the immune system recognizes as either part of the body or an outside invader
11. the constant small corrections that normally occur to keep an organism’s internal environment within the limits needed for survival
14. a life process that involves combining simple substances into more complex substances
15. the body’s primary defense against disease-causing pathogens
16. any change in the environment that causes an organism to react

2. the ability of an organism to maintain a stable internal environment even when the external environment changes
3. an organism that invades the body, causing disease
5. a substance made of weakened, killed, or partial pathogens and designed to protect the body from future invasions of that pathogen
6. a substance that can speed up the rate of a chemical reaction without being changed or used up during the reaction
7. a protein, produced by the immune system, that either attacks invading pathogens or marks them for killing
9. a sugar that is a major source of energy for cells
10. an organism that survives by living and feeding on other organisms
12. proteins that speed up the rate of chemical reactions in living things
13. (adenine triphosphate) a compound that stores energy in cells