Human body of different cavities, separated areas which house different organ systems. The brain and central nervous system reside in an area protected from the rest of the body by the blood brain barrier. The lungs sit in the pleural cavity. The intestines, liver, and spleen sit in the abdominal cavity Height, weight, shape and other body proportions vary individually and with age and sex. Body shape is influenced by the distribution of muscle and fat tissue. Human physiology is the study of how the human body functions. This includes the mechanical, physical, bioelectrical, and biochemical functions of humans in good health,
Organ trade necessity. Organ trade Organ trade is the trade of human organs, tissues, or other body products, usually for transplantation. There is a global need or demand for healthy body parts for transplantation, far exceeding the numbers available. , about 114,000 people were reported to be waiting for a new organ in the United States. On average, an individual will wait three and a half years for an organ to become available for transplant. There is a worldwide shortage of organs available for transplantation, yet commercial trade in human organs is illegal in all countries except Iran. Despite these prohibitions, organ