An organ is any part of a living thing that does a particular job. In animals and plants with many cells, (We call them metazoa and metaphyta) lots of cells stick together to make parts we cal tissues, such as fat, nerve and muscle. The tissues are fitted together into working parts, and such working parts we call organs. They could be sense organs like ears and eyes, or digestive organs like teeth and your stomach, or protective organs like your eyelids, eyelashes, and skin, or glands that produce substances that your body needs, like salivary glands, tear glands and your pancreas. Organs like your pancreas and liver have more jobs than just one. The liver in particular changes substances in your body into other substances that are not so harmful, or more useful, it stores substances that you need. It produces hormones that help in the control of your body. It produces enzymes and other substances that you gut needs for digesting food.
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