With oxygen it is called aerobic respiration
Without oxygen it is called anaerobic respiration
Anaerobic respiration can take place in muscle cells when there is a shortage of oxygen. This causes a buildup of lactic acid in the muscles. A build up of lactic acid is what causes the burning sensation we feel when we exercise.
Anaerobic respiration is the principle behind fermentation. This process represents the fermentation process in yeast fermentation.
C6H12O6 → 2C2H5OH + 2CO2 +2ATP(energy)
Glucose ethanol + carbon dioxide
Fermentation is also used to produce alcohol.
ATP- ADENOSINE TRI-PHOSPHATE
Respiration results in the creation of ATP (Adenosine Triphosphate) through a process known as the Krebs cycle. This process takes place on the membranes of the mitochondrion (the powerhouse of cells).
Adenosine Tri-phosphate is the form of energy used by the body. It provides cells with the energy needed to carry out their functions. When there is an excess of ATP then it is stored in the mitochondria to be used needed.