Most WHO departments have their own procedures for supporting research in priority areas-these vary from requesting letters of intent to issuing a call for proposals to commissioning research.
In humans and other mammals, the anatomical features of the respiratory system include trachea, bronchi, bronchioles, lungs, and diaphragm. Molecules of oxygen and carbon dioxide are passively exchanged, by diffusion, between the gaseous external environment and the blood.
A diagram of a kidney, a major part of the urinary system. Several abdominal organs, including the pancreas, liver, and gallbladder. The human respiratory system, showing the trachea, bronchioles, and lungs.An illustration of a human stomach. diagram of a kidney, a major part of the urinary system. Several abdominal organs, including the pancreas, liver, and gallbladder. The human respiratory system, showing the trachea, bronchioles, and lungs. An illustration of a human stomach.