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.
1 Respiration is defined as the catabolic biochemical process during which organic compounds break down in order to release energy.  The organic compounds that are broken down are called the substrates. Glucose is the most common substrate.