The goals of respiration are to provide oxygen to the tissues and to remove carbondioxide , to achieve these goals , respiration can be divided into four major functional events ,
1. pulmonary ventilation ,
2, diffusion of oxygen and carbondioxide between the alveoli and the bloods.
3, transport of oxygen and carbon dioxide in the blood and body fluids to and from the cells ,
4, regulation of ventilation and other facets of respiration .