Cellular Respiration• Process used by cells to

release energy from foods using oxygen (aerobic)

• Involves glycolysis, the Krebs Cycle, & e- transport chain

• 6 O2 + C6H12O6

6 CO2 + 6 H2O + Energy

Video: http://www.copernicusproject.ucr.edu/ssi/HSBiologyResources.htm

Cellular Respiration--Releasing stored energy by breaking down glucose

Glycolysis

• Beginning process of breaking down glucose;

• releases only a small amount of energy (ATP);

• happens in the cytoplasm

• one molecule of glucose is split in two molecules of pyruvic acid

• A net gain of 2 ATP & 2 NADH are produced

• Happens very fast & doesn’t require oxygen (anaerobic)

Fermentation• anaerobic way to process

food to get energy

• 2 kinds– Alcoholic

– Lactic Acid

Alcoholic Fermentation

• Pyruvic acid + NADH

alcohol + CO2 + NAD+

• Used by yeasts & other microorganisms

Lactic Acid Fermentation

• Pyruvic acid + NADH

lactic acid + NAD+

• This process regenerates NAD+ so that glycolysis can cont.

• Can be done without oxygen

Lactic Acid Cont. (DON’T COPY)• Muscle cells can build up lactic acid when

they are forced to work without enough of an oxygen supply

– muscle cells need energy for movement whether oxygen is available or not

– without oxygen, cells switch from cellular respiration to lactic acid fermentation to get ATP

– build up of lactic acid creates burning sensation in muscles

– You are out of breath after a sprint because your body is trying to get oxygen back to the muscles

Video

• From food to ATP

• http://www.copernicusproject.ucr.edu/ssi/HSBiologyResources.htm