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.
The main organs of the respiratory system are the nose, pharynx, trachea, bronchi, and lungs. + 174 others found this useful. Kevin Leung.Edit.onfidence votes 364. The main organs in the human respiratory system are the Lungs, Trachea, Bronchi, Alveoli, Diaphragm, Nose, and mouth.