spine - the line of bones down the centre of the back that provides support for the body and protects the spinal cord, kidney - either of a pair of small organs in the body that take away waste matter from the blood to produce urine, bladder - an organ like a bag inside the body of a person or animal, where urine is stored before it leaves the body, brain - the organ inside the head that controls thought, memory, feelings, and activity, muscle - one of many tissues in the body that can tighten and relax to produce movement, lung - either of the two organs in the chest with which people and some animals breathe, digestive tract - the tube-like passage from the mouth, through the stomach and to the anus, through which food travels during digestion, skin - the natural outer layer that covers a person, animal, fruit, etc., nerve - a group of long, thin fibres (= structures like threads) that carry information or instructions between the brain and other parts of the body, intestine - (either of the two parts of) a long tube through which food travels from the stomach and out of the body while it is being digested, bloodstream - the flow of blood around the body, blood vessel - any of the tubes through which blood flows in the body, joint - a place in your body where two bones are connected, collarbone - a bone between your shoulder and neck on each side of your body, skeleton - the frame of bones supporting a human or animal body, heart - the organ in your chest that sends the blood around your body,

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