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.
Edmund Alexander Parkes Exercise on the Elimination of Nitrogen". He confirmed independently the observations of Adolf Eugen Fick and Johannes Wislicenus, against Justus Liebig's theory that muscular work implies the destruction of muscular tissue by oxidation. Parkes suggested that the elimination of urea is not dependent on the amount of muscular exercise, but on the consumption of nitrogenous food; and that muscular tissue does not consume itself as a fuel doing work. His experiments on the effects of alcohol on the human body (in which he was assisted by Cyprian Wollowicz) were in three papers (in 1870, 1872, and 1874), on the "Effects