Fermentation
The answer you're looking for is either catabolism, cellular respiration, or glycolysis. Glycolysis is the first step in cellular respiration and it is the exact step when glucose is broken down. The equation (from Wikipedia) for glycolysis:
glucose + 2 NAD+ + 2 ADP + 2 Pi → 2 pyruvate + 2 NADH + 2 H+ + 2 ATP + 2 H2O
Following glycolysis is usually some form of anaerobic(fermentation) or aerobic respiration(Krebs Cycle + electron transport chain).
Catabolism is just a general term for the breakdown of molecules.
anaerobic respiration (if it still involves an electron transport chain)
or fermentation (if it uses neither oxygen (O2) nor an electron transport chain)
if it does use an electron transport chain, it is with another molecule other than Oxygen, because it is still anaerobic (ex: some marine bacteria organisms utilize the electronegative Sulfur ion instead of oxygen which is scarce)
Aerobic respiration if its with oxygen and anaerobic respiration if its without oxygen. Aerobic respiration if its with oxygen and anaerobic respiration if its without oxygen.
This process is known as cellular respiration.
This process is called glycolysis.
Fermentation
NAD+
Glycolysis
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respiration
Another function of the Kreb's cycle other than to continue the breakdown of glucose is to release energy. It gives the cell more energy to complete other processes.
Phosphorylation
The production of ATP from the breakdown of glucose.
For energy, they need energy to keep the organism they're part of going. Cells use oxygen (if possible) to break down the glucose into carbon dioxide and water. This is called aerobic respiration. If not oxygen is available (if your using a lot like during exercise) then the cells will break down the glucose anaerobically to make lactic acid which can hard your cells. This all happens in the mitochondria of your cells.
The ATP molecule is the one that releases energy by the breakdown of glucose molecules. This provides energy to most of the cell functions.
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We concentrate on glucose breakdown, since it dominates energy production in most animal cells.
respiration
Exothermic. Glucose is one of the major source of energy of the body and can only act as an energy source because its breakdown into CO2 is an exothermic reaction.
Cortisol stimulates the breakdown of protein into glucose, raising blood sugar, thereby providing more energy to deal with stress.
The mitochondrion
We concentrate on glucose breakdown, since it dominates energy production in most animal cells.
An organic acid formed during energy production from the breakdown of glucose when there is not enough oxygen available for the complete breakdown of glucose hahahahahahahahahahahahahahahahahahahahahahahahah!!!!!!!!!!!
glucagon and insulin are responsible for regulating glucose levels in normal circumstances glucagon promotes glycogen breakdown into glucose for energy insulin promotes glucose storage as glycogen however in times of danger adrenaline also affects glucose levels as it promotes significantly glycogen breakdown into glucose for extra energy
During glucose breakdown, glycolysis and fermentation occur anaerobically. Glycolysis breaks a glucose molecule into energy and pyruvate. Fermentation uses to the pyruvate to form either ethanol or lactate.
Another function of the Kreb's cycle other than to continue the breakdown of glucose is to release energy. It gives the cell more energy to complete other processes.