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Across 2. a muscle that is attached to the bones of the skeleton and provides the force that moves the bones; also called striated muscle. 4. an organ that produces and releases chemicals either through ducts or into the bloodstream. 9. the processes by which nutrient molecules pass through the wall of the digestive system into the blood. 10. a place in the body where two bones come together. 11. substances in food that provide the raw materials and energy needed for an organism to carry out its essential processes. 12. a body tissue that covers the interior and exterior surfaces of the body. 13. any change or signal in the environment that can make an organism react in some way. 14. the inner framework made up of all the bones of the body.

Down 1. a body tissue that carries electrical messages back and forth between the brain and other parts of the body. 3. a body tissue that provides support for the body and connects all its parts. 5. the act or process of differentiating, or the state of being differentiated. 6. an action or change in behavior that occurs as a result of a stimulus. 7. a body tissue that contracts,or shortens, making body parts move. 8. a chemical that affects growth and development.