Chapter 9

Cellular Respiration The process that releases

energy (ATP) by breaking down food molecules in the presence of oxygen

Mitochondria Found?

Plant & Animal Cells Where respiration

takes placeJust aerobic parts

Aerobic Vs. Anaerobic Respiration Aerobic = presence of O2

Respiration

Anaerobic = absence of O2

Fermentation

Pathway of Cellular Respiration Glycolysis (Cytoplasm)

Krebs Cycle (Mito.) Electron Transport Chain (Mito.)

Glycolysis “Glukus” = sweet “Lysis” = loosening Occurs in Cytoplasm Breaking one glucose down into 2

pyruvic acids(3 Carbon) & 2 ATP (net)

After Glycolysis Anaerobic = Fermentation Aerobic = Cellular Respiration

Fermentation Fermentation will make energy

without O2

Two typesAlcoholicLactic acid

Alcoholic Yeast & other microorganisms CO2 causes bread to rise

Lactic Acid Animal muscles Happens during vigorous exercise Builds up in muscles causing

cramps

Krebs Cycle Follows glycolysis Needs oxygen

Respiration Occurs in mitochondria Breaks down products of glycolysis

into carbon dioxideReleasing energy to make electron

carriers and ATP

Krebs Cycle

Electron Transport Chain Inner membrane of mitochondria Electrons move to produce

energy

ETC: Makes ATP – 2-3 per electron carrier Oxygen is used as the final electron

acceptor (H+) Forms water

Mitochondrial membrane

NADHNADH enters and releases an H+ and an electron.

Mitochondrial membrane

NADH enters and releases an H+ and an electron.

e-

NAD+

Mitochondrial membrane

The electron travels to the next protein while simultaneously sending H+ across the membrane

e-

H+H+ H+

H+

H+H+ H+H+O

Mitochondrial membrane

The electron is used to form water. The H+ then are pumped back into the mitochondria.

H+ H+H+

H+H+ H+

H2O

ADP

P

Mitochondrial membrane

This allows ATP to be made each time a H+ enters back in.

H+

H+

H+

H+H+ H+

ATP

Totals Glycolysis

Net 2 ATP Krebs

2 ATP ETC

Electron carriers =

32 ATP

**Total = 36 ATP

Photosynthesis Vs Cellular Respiration