Internal anatomy. Computer artwork of a body showing the internal organs. The thyroid gland (yellow, top) lies in front of the trachea (windpipe, white), which leads to the lungs (pale brown). These oxygenate the blood, which is pumped round the body by the heart (red). Beneath the heart is the liver (brown) and the stomach (purple), and one kidney (pale brown) is seen to the right of the stomach. Food passes from the stomach to the small intestines (pink), which extract nutrients, before the semi-digested food passes to the large intestine (orange), where water is absorbed. The bones of the skeleton protect and support the body.