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 bronchi is the word for one of the bronchus which is either of the two primary divisions of the trachea that lead respectively iâ¦nto the right and the left lung (Miriam-Webster Medical Dictionary).  http://www2.merriam-webster.com/cgi-bin/mwmednlm   These are commonly called the bronchial tubes.