"breaking down food into simplier substances that your body can use", "digestion" "a watery fluid that softens and moistens food", "saliva" "the long muscular tube that brings food into the stomach", "esophagus" "a muscular organ that changes food into a thick soupy liquid", "stomach" "the organ that completes digestion and allows digested food to enter the blood", "small intestine" "the thick tube-like organ that removes undigested waste", "large intestine" "a large, flat muscle that pulls air in and pushes air out of the lungs", "diaphragm" "one of two organs that fills with air when you inhale", "lung" "air sacs in the lungs where gases move into and out of the blood", "alveoli" "a muscular organ that constantly pumps blood throughout the body", "heart" "a thick-walled blood vessel that carries blood away from the heart", "artery" "a blood vessel that carries blood back to the heart", "vein" "a tiny blood vessel", "capillary" "an organ that filters certain body wastes out of the blood", "kidney" "a part of the kidneys where waste materials are separated from useful materials in the blood", "nephron" "a tube that carries urine from the kidney to the urinary bladder", "ureter" "an organ that stores liquid wastes from the kidneys temporarily", "(urinary) bladder"
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