Sac - a part of a plant or animal that is like a bag and often contain liquid., enlarge - to become bigger or to make something bigger:, alimentary canal - the whole passage along which food passes through the body from mouth to anus. It includes the esophagus, stomach, and intestines., vertebrate - having a spine (back bone), cavity - a hole, or an empty space between two surfaces:, secrete  - (of animals or plants or their cells) to produce and release a liquid:, excrete - to get rid of material such as solid waste or urine from the body:, abdomen - the lower part of a person's or animal's body, containing the stomach, bowels, and other organs, or the end of an insect's body, chest - the upper front part of the body of humans and some animals, between the stomach and the neck, containing the heart and lungs, metabolism - all the chemical processes in your body, especially those that cause food to be used for energy and growth:, metabolic - the chemical processes within the body required for life, circulate - To move around or through, regulate - to control something, especially by making it work in a particular way:, acidity - the amount of acid in a substance or in your stomach:, contract - decrease in size, number, or range., diffuse - to spread in many directions:, chamber - a closed space in a  body (room),

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