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 the plural of bronchus meaning any of the larger passages conveying air to and within the lungs. This has to do with respiration sequence which begins as air enters â¦ the nose or mouth where it is warmed or moistened and then passes through the pharynx, larynx, and trachea and into the bronchi.he primary bronchi are the two air tubes that branch off of the Trachea, primary bronchi divide to form secondary bronchi which in turn form tertiary bronchi .and finally bronchioles All bronchi & bronchioles carry air ultimately to alveoli.