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.
Bronchi is plural. The primary right and left bronchi direct the air into the right and left lungs. It then splits to go to each l â¦ obe of the lung. These tubes are secondary or lobar bronchi.The next division is the bronchiole tree, the alveolar duct and the alveolar sacs or clusters.ronchi is plural. The primary right and left bronchi direct the air into the right and left lungs. It then splits to go to each l â¦ obe of the lung. These tubes are secondary or lobar bronchi.