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Across 4. Secrets hormones that regulates body activites, homeostasis 6. Defends against infections and cancer 8. Delivers O2 to body cells, CO2 to lungs, wastes kidneys 14. Produces gametes and sex hormones 15. Returns body fluid to circulatory system and functions part of immune system

Down 1. Moves body, maintains posture, and produces heat 2. Protects against infection, heat or cold, and drying out 3. Where body cells are bathed and must pass through 5. Ingest and digest food, absorbs nutrients, eliminates undigest material 7. Exchange gases, supplies blood with O2 and disposes of CO2 9. Removes waste from blood and excretes urine 10. Coordinates body activities detecting stimuli, integrating information, directing responses 11. Supports the body, protects organs, framework for muscle movement 12. Change in a variable triggers a reverse in the mechanism 13. Steady state. Outside forces that changes internal environment.