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Across 4. Cavity that subdivides into the Cranial Cavity and Spinal Cavity. 6. A body structure that monitors changes (stimuli) in the environment and sends information (input) in the form of nerve impulses to the control center. 7. Mechanism that regulates homeostasis using the nervous system and endocrine system. 8. The word ending. Modifies the root word meaning. 11. The foundation of the word. Often pertaining to a body part of system. 13. Feedback mechanism response in which a stimulus initiates actions that reverse or reduce the stimulus. 20. Study of chemical reactions. 22. The ability of the body’s internal environment to remain relatively constant even though the outside environment is constantly changing. 23. Longitudinal plane of the body, dividing it into left and right parts. 24. Position assumed for the body in the study of anatomy. Body erect, feet parallel, palms face forward, thumbs point out. 25. Study of the cell.

Down 1. Longitudinal plane of the body, dividing it into anterior and posterior parts. 2. Added to the beginning of the root word to modify the meaning. 3. A body structure that receives output commands from the control center and produces a response that changes the controlled condition. 5. Feedback mechanism response in which the response enhances the original stimulus. 9. Cavity that subdivides into the Thoracic Cavity and Abdominopelvic Cavity. 10. Horizontal plane of the body, dividing it into superior and inferior parts. 12. Disc-shaped muscle that separates the Thoracic Cavity and Abdominopelvic Cavity. 14. Study of body structures and the relationship between them 15. Study of tissue. 16. Study of motion of the body. 17. Study of the body functions, how body parts work. 18. ________ center sets the normal range of values for which conditions should be maintained; evaluates input and generates output commands if needed. 19. Study of diseases and their effect on the body. 21. ________ vowel. Usually ‘o’. Links the root word to the suffix or a root word to another root word.