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 major organs of the respiratory system are the lungs, trachea, bronchi and diaphragm. The respiratory system works together with the cardiovascular system to deliver oxygen to the organs and with the autonomic nervous system to regulate breathing. Continue Reading.