Across
- 4. - The main airways that branch off from the trachea and carry air to and from the lungs.
- 6. - A group of cells that have a similar structure and function, and work together to perform a specific task.
- 8. - A blood vessel that carries deoxygenated blood back to the heart.
- 9. - An automatic, involuntary response to a stimulus.
- 11. - Substances in food that provide energy, promote growth, and maintain life.
- 15. - Macronutrients that are the body's main source of energy.
- 17. - The body's physical, mental, or emotional response to a demand or challenge.
- 18. - The functional unit of the kidney, responsible for filtering blood and producing urine.
- 21. - The junction between two neurons where electrical or chemical signals are transmitted.
- 22. - The bundle of nerves that extends from the base of the brain and connects it to the rest of the body.
- 25. - The process of breaking down food into smaller components that can be absorbed and used by the body.
- 26. - A mechanism in which the output of a system is used to reduce or limit the input, thereby maintaining a stable state.
- 29. - The system that pumps blood, nutrients, oxygen, and other substances throughout the body.
- 30. - A specialized cell in the nervous system that transmits electrical signals.
Down
- 1. - To become smaller or narrower; to draw together or become reduced in size.
- 2. - A chemical substance produced by the body's glands that regulates the function of cells or organs.
- 3. - The smallest blood vessels in the body, where the exchange of oxygen, nutrients, and waste products occurs between the blood and body tissues.
- 5. - The rhythmic contraction and relaxation of the muscles in the digestive tract that propels food through the system.
- 7. - A sudden, strong desire or urge to act.
- 10. - A clear fluid that travels through the lymphatic system and helps remove waste and toxins from the body.
- 12. - A protein that speeds up chemical reactions in the body.
- 13. - An organ that secretes hormones or other substances into the bloodstream or body cavities.
- 14. - A group of organs that work together to perform a specific function or set of functions in the body.
- 16. - A structure made up of two or more types of tissues that work together to perform a specific function in the body.
- 19. - The process of eliminating waste products from the body.
- 20. - The way in which two or more things or people affect each other.
- 21. - Able to maintain a steady state or position; not easily disturbed or changed.
- 23. - A watery substance secreted by the salivary glands that helps to moisten and break down food in the mouth.
- 24. - Something that causes a physiological or psychological response.
- 27. - A blood vessel that carries oxygenated blood away from the heart to the body's tissues.
- 28. - The central organ of the nervous system, responsible for coordinating and controlling various body functions.