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.
Introduction to respiration. Respiration is the process by which cells [cell: Basic unit of life. Unicellular organisms only have one cell. Multicellular organisms have many cells.] obtain energy in the form of adenosine tri-phosphate or ATP.