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Cell Respiration
Cell Respiration
What happens when you do not eat for a while?
Tired, lethargic
We have to undergo this process in order to live!
Cell Respiration
Food is broken down so mitochondria can
produce ATP
ATP—Useable energy
Occurs in animals
Two Types of respiration:
Anaerobic-requires no oxygen
Aerobic-requires oxygen
Three Cycles of cell respiration:
Glycolysis
Krebs Cycle (Citric Acid Cycle)
Electron Transport Chain (ETC)
3 Cycles of Cell
Respiration
Glycolysis
Anaerobic
Breaks down sugar to form ATP
2 molecules of ATP are formed
Occurs in the cytoplasm
Krebs Cycle
Aerobic
1 molecule of ATP is formed
2 molecules of CO2 are formed
Occurs in the mitochondria
ETC
Aerobic
Produces 32 ATP
Occurs in the mitochondria
Cell Respiration
General Equation: C6H12O6 + 6O2
6CO2 + 6H2O + E
Which cycle was most effective?
ETC….it produces 32 ATP’s.
What would happen if the oxygen level ran low?
ETC would not produce enough ATP to keep you going
Does that ever happen?
YUP! Working out….
Every time you run our of breath do you immediately pass
out?
Nope….b/c of FERMENATION!
Fermentation
You can over work your mitochondria….can’t produce
enough energy to support your activity.
When oxygen levels are low your body will undergo lactic
acid fermentation.
Follows Glycolysis instead of going into Krebs cycle
Anaerobic
Can produce 2 ATP
Not comparable to Cell Respiration (36 ATP) but keeps us
going until our oxygen levels are back to normal.
Lactic Acid
Fermentation
During a workout you may deplete the oxygen levels in
your cells.
Your body keeps working though
Lactic acid forms in you cells (ex: muscle cells)
The acid is then brought to your liver and converted into 2
ATP.
Liver can only process so much at time
Acid is backed up….can harden = CRAMP!
Must slow down…let you oxygen levels increase.