Split down the middle, a skinless human cadaver offers an eye on the body's inner workings. The stomach (the large, pale, smooth sac) and intestines (the tangled, membrane-covered mass of "tubes" below the stomach) are particularly evident, protruding from the right half of the corpse. The stomach partly digests food by churning it and bathing it in gastric acid. The intestines finish the job using digestive enzymes.
The cadavers in "Bodies" are preserved using a process called plastination, or plasticization. In the process body water and fats are replaced with liquid silicone rubber.