Across
- 4. Substances in food that your body needs to grow, to repair itself, and to supply you with energy.
- 9. __________ system: The organs of the urinary tract comprising the kidneys, ureters, urinary bladder, and urethra.
- 12. Lymph _________: bean-shaped organs that filter out microorganisms and foreign materials that have been taken up by lymphocytes.
- 13. The basic filtering units in the kidneys
- 16. Starches and sugars found in foods, which provide your body's main source of energy.
- 17. Rhythmic muscular contractions that squeeze food through the esophagus into the stomach.
- 19. Substances needed in small quantities to help regulate body functions.
- 20. _________ organs: Spleen, thymus, lymphatic vessels, lymph nodes, tonsils.
Down
- 1. Small fingerlike projections on the walls of the small intestines that increase surface area.
- 2. A pair of breathing tubes that branch from the trachea into the lungs.
- 3. The windpipe; a passage through which air moves in the respiratory system.
- 5. __________ system: The body system that helps rid the body of wastes, toxins, and excess water.
- 6. A type of white blood cell that makes antibodies to fight off infections.
- 7. _______ acids: the building blocks of protein.
- 8. Nutrients that are needed by the body in small amounts and are not made by living things.
- 10. ___________ system: a collection of organs whose primary function is to take in oxygen and expel carbon dioxide.
- 11. _________ system: Breaks down food into absorbable units that enter the blood for distribution to body cells.
- 14. A type of protein that speeds up a chemical reaction in a living thing.
- 15. Structure in the throat that contains the vocal cords.
- 18. The fluid that is circulated through the lymph vessels.