Chapter 9 CELLULAR RESPIRATION

Cellular Respiration The process that releases energy (ATP) by breaking down food molecules in the presence of oxygen

Mitochondria Found? Where respiration takes place Plant & Animal Cells Just aerobic parts

Aerobic Vs. Anaerobic Respiration Aerobic = presence of O2 Respiration 36 ATP per glucose Anaerobic = absence of O2 Fermentation 2 ATP per glucose

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 types Alcoholic Lactic 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 Occurs in mitochondria Respiration Occurs in mitochondria Breaks down products of glycolysis into carbon dioxide Releasing 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

NADH enters and releases an H+ and an electron. Mitochondrial membrane NADH NADH enters and releases an H+ and an electron.

NADH enters and releases an H+ and an electron. Mitochondrial membrane e- NAD+ NADH enters and releases an H+ and an electron.

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

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

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

Totals Glycolysis Krebs ETC **Total = 36 ATP Net 2 ATP 2 ATP Electron carriers = 32 ATP **Total = 36 ATP

Photosynthesis Vs Cellular Respiration