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.
respiration. n. 1. (Biology) the process in living organisms of taking in oxygen from the surroundings and giving out carbon dioxide (external respiration). In terrestrial animals this is effected by breathing air.