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Across 2. The study of structures and relationship among structures of the body 5. Groups of tissues which perform complex functions 7. Breakdown of nutrients into small molecules that can be used by body cells 11. Ability to increase the size of a cell or organism 12. The appropriate organ system to make the correct response to changing variable 13. Sensors that monitor the environment and sense a change 18. Analyzes input from receptors and determines if an adjustment is needed 20. Removal of wastes from the cells or body 21. The sum of all chemical reactions that break down and create complex chemicals to produce energy 22. When the response by the effector acts to increase or enhance the stimulus on the receptor 23. The ability to maintain relatively stable internal conditions even though the external environment is constantly changing

Down 1. Level of organization made of multiple atoms held together by chemical bonds 3. The smallest stable unit of matter 4. A condition that changes or varies, such as body temperature or oxygen concentration of blood 6. Replacement of cells within the body 8. When the response by the effector acts to reduce the stimulus on the receptor 9. The ability to detect and react to changes in the external or internal environment 10. Ability of a cell or organism to move from one place to another 14. Smallest functional level of organization in the body 15. Group of organs working together to perform one or more functions 16. The study of functions of body parts or systems 17. Many organ systems working together to perform many functions 19. Level of organization made of cells which perform a specialized function