1. a(n) is a substance that in the chemical digestion of food. epiglottis enzyme gallbladder peristalsis 2. the is a small flap of tissue that closes the windpipe when you swallow food to keep you from. choking. epiglottis enzyme gallbladder peristalsis 3. which of the following organs is where most nutrients are absorbed? large intestine esophagus small intestine stomach 4. the kidneys contains millions of tiny filtering units called. urine. villi. peristalsis. nephrons. 5. the kidneys have the important job of. reabsorbing water into the bloodstream. filtering the blood to remove wastes. breaking down food mechanically. producing bile to digest fats. 6. proteins are made up of substances called. amino acids. sugars. carbohydrates. starches. 7. according to the chart “recommended servings per day for 16-year-olds”, which food group do teenagers need the least? (hint: 8 ounces = 1 cup). protein dairy vegetables grains