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 a process that takes place in cells and turns oxygen and sugars (such as glucose) into water, carbon dioxide, and energy that our body can use. This process, by the way, is the reason that we inhale oxygen and exhale carbon dioxide.