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.
Cooperative Human Tissue Network Cooperative Human Tissue Network The Collaborative Human Tissue Network (the CHTN) was established in 1987 by the National Cancer Institute in response to an increase in the demand for high quality biospecimens for cancer research. The purpose of the CHTN is to stimulate, for the good of the public, cooperative efforts to collect and distribute human biospecimens and to thereby facilitate research utilizing those specimens. These activities are expected to encourage basic and developmental studies in many areas of cancer research, including molecular biology, immunology and genetics. The CHTN is not intended to be a human tissue bank, but instead