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Across 2. mixture of solute and solvent 5. latin for "middle space"; lies between the left and right pleura 9. breakdown of substances into simpler ones 11. atoms with the same number of protons but different numbers of neutrons 14. divides structures into anterior and posterior parts 16. alkali, caustic; absorbs hydrogen ions when dissolved in water 17. bonds formed when atoms share electrons 21. basic building block of everything 22. pushes a detected change strongly in the same direction until the process is completed 24. a substance that cannot be reduced to a simpler substance by normal forces 25. a value at which the condition must be maintained for optimal health 26. any substance that is created by and ionic bond 27. cause of injury

Down 1. atom with an electrical charge 3. the key to homeostasis; it keeps systems regulated and promotes stability 4. the number of protons in the nucleus constitutes this 6. pressure exerted by the weight of a gas or fluid pressing down on a point 7. a state of abnormal form and function 8. chemical that releases hydrogen ions when dissolved in water 10. chemical that converts a stronger acid into a weaker acid 12. synthesis;growth 13. the paths along which electrons move 15. a solvent, lubricant, cushion, and heat sink; necessary for life 18. complaints reported by the patient 19. the body's effort to maintain internal conditions within a stable physiologic range 20. the difference in the concentration of a substance between two areas 23. basic building block of life 24. specialized proteins that facilitate chemical reactions