pill – n. a small, rounded object that you swallow and that contains medicine

stomach – n. the organ in your body where food goes and begins to break down after you swallow it

synthetic – adj. made by combining different substances; man-made, not natural

digestive tract – n. a series of organs in the body, including the stomach and the intestines

detector – n. a device for identifying or measuring the presence of something

challenge – n. a problem; an invitation to compete

transmitter – n. a device that sends out signals