Human body include the heart, lungs and liver. Many organs reside within cavities within the body. These cavities include the abdomen and pleura. The circulatory system comprises the heart and blood vessels (arteries, veins and capillaries). The heart propels the circulation of the blood, which serves as a "transportation system" to transfer oxygen, fuel, nutrients, waste products, immune cells and signalling molecules (i.e., hormones) from one part of the body to another. The blood consists of fluid that carries cells in the circulation, including some that move from tissue to blood vessels and back, as well as the spleen and bone marrow.
History of beliefs about the human body be detected. Definitions of the body and it's disorders therefore focus on physical manifestations of energy through the body. This is mostly seen in Chinese Traditional Medicine and has today been explained in physical ways by modern science. The ideal body of east Asian medical literature was not muscular and instead focused on key energy manifestations in the body for directed therapy. The Yellow Emperor's Body is a term derived from the references to the Yellow Emperor within the Ancient Chinese book, the "book of change". The Term describes the references to both the physical body that can be touched,