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 lungs, trachea, bronchi, bronchial tubes, ribs, diaphrahm, nasal cavity, esophagus, pharnx, aveoli, nose and the mouth. The windpipe and the bronchial tubes are parts of the respiratory system. The air enters and exits through the nose and mouth.he components of the respiratory system are the nose, pharynx, larynx, trachea, bronchi and lungs.