TORONTO -. Mike Babcock's first exhibition schedule as coach of the Maple Leafs will take him to some interesting arenas.
There are two types of 'respiration': pulmonary (visible breathing) and cellular (which is not visible). In pulmonary respiration the unwanted gas expelled is mainly carbon dioxide. This is then replaced during the inhalation breathing phase by the oxygen content in the air.
Cellular respiration is the process through which our cells get the energy to perform their functions. Since all living things are made of cells, and all cells need energy to perform life's functions, cellular respiration is necessary for all living things.