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Across 3. A slippery and somewhat sticky fluid secreted by the glands in mucous membranes. 4. A chemical substance produced in the body that controls and regulates the activity of certain cells or organs. 6. The tissue that connects two bones to form a joint. 7. prefix meaning "against, opposite or opposing, and contrary." 8. The process in which cartilage is transformed into bone. 10. Successive waves of involuntary contraction passing along the walls of a hollow muscular structure (as the esophagus or intestine) and forcing the contents onward. 12. A prefix meaning excessive, over, high, beyond. 13. The production of an organic compound in a living thing from more simple molecules, especially as aided by enzymes. 14. A substance which speeds up a reaction, but is chemically unchanged at the end of the reaction. 15. The functional unit of the kidneys.

Down 1. The process of taking in food and using it for growth, metabolism, and repair. 2. The tendency of the body to seek and maintain a condition of balance or equilibrium within its internal environment, even when faced with external changes. 5. The chemical processes by which a plant or an animal uses food, water, etc., to grow and heal and to make energy. 7. A protein produced by the body's immune system when it detects harmful substances called antigens. 9. The tough but flexible tissue that covers the ends of your bones at a joint. 11. Proteins that act as catalysts to accelerate chemical reactions in the body.