CELLULAR RESPIRATION REACTIONS

Glycolysis, Aerobic / Anaerobic respiration, Kreb's Cycle and Electron Transport Chain

Glycolysis

A series of reactions that break down a 6-carbon molecule into two 3-carbon molecules called pyruvate.

ATP Yield in Glycolysis

Yields 2 ATP molecules for every one glucose molecule broken down.

NADH Production

Glycolysis yields NADH per glucose molecule.

Anaerobic Cellular Respiration

Occurs in the cytoplasm without oxygen, resulting in no additional ATP and regenerating NAD+.

End Products of Anaerobic Respiration

Produces ethanol and CO2 in yeast (ethanolic fermentation) or lactic acid in muscle cells (lactic acid fermentation).

Aerobic Cellular Respiration

Occurs in mitochondria and requires oxygen which results to no more ATP, only to regenerate NAD+

Kreb's Cycle

Completes the breakdown of glucose in the mitochondria, producing CO2 and H2O.

CO2 and H2O

released in Kreb's cycle in taking pyruvate and breaks it down, releasing carbon and oxygen

Electron Transport Chain

A series of steps where electron carriers from the Kreb's cycle release energy to form a total of 32 ATP.

Oxygen

Acts as the final electron acceptor in the electron transport chain, forming water.

Pyruvate

3-C molecule

2 ATP and 2 NADH

products of Glycolysis

cytoplasm

where glycolysis occurs

mitochondria

where Kreb’s cycle occurs

ethanol, CO2, lactic acid

end products of anaerobic respiration

Kreb’s cycle

completes the breakdown of glucose

2 ATP

product of Kreb’s cycle

NADH and FADH2

hydrogens and electrons are stripped and loaded onto NAD+ and FAD resulting to ______.

32 ATP

product of ETC

oxygen

final electron acceptor

36/38

total of ATP produced in cellular respiration

1.5/2 ATP

Yield from Electron Carrier 1 FADH2

2.5/3 ATP

yield from electron carrier 1 NADH