Respiration

Do cells breathe?
Cells do not breathe, but they respire instead.
Respiration
Respiration is the chemical process of releasing energy from food. Respiration occurs all the time - day and night. There are two types respiration, aerobic and anaerobic.
Aerobic respiration
Aerobic respiration occurs in absence of a lot of oxygen; hence, it produces lots of energy.
Anaerobic respiration
Anaerobic respiration occurs in absence of no or a little oxygen; hence, it produces no or a little energy.
How respiration works
In aerobic respiration, food (such as glucose) combines with oxygen in living cells to release energy needed by the cell. Heat energy will also be released through this chemical process. The waste products of respiration are carbon dioxide and water.