Biology I CELLULAR RESPIRATION CELLULAR RESPIRATION the process

Biology I CELLULAR RESPIRATION

CELLULAR RESPIRATION the process in which glucose is broken down to produce ATP (energy) Ø Performed by ALL cells (plant, animal, bacteria) Ø Two pathways 1. Aerobic Respiration 2. Anaerobic Respiration Ø Both begin with Glycolysis Ø

CELLULAR RESPIRATION PATHWAYS Cellular Respiration Glycolysis Oxygen present Aerobic Respiration Krebs Cycle Electron Transport Chain Oxygen absent Anaerobic Respiration Alcoholic Fermentation Lactic Acid Fermentation

CELLULAR RESPIRATION Chemical equation C 6 H 12 O 6 + 6 O 2 ----> 6 CO 2 + 6 H 2 O + 36 ATP Word equation Glucose + oxygen -- carbon dioxide +water+ATP

GLYCOLYSIS Begins with one 6 carbon glucose molecule which will split into two 3 carbon pyruvic acids Ø Happens in the cytoplasm Ø 2 ATP’s will be produced Ø Glucose 2 Pyruvic Acids + 2 ATP

AEROBIC RESPIRATION § § 1 Must have oxygen present Happens in the mitochondria Produces 36 ATP’s from one glucose molecule Has 3 steps Glycolysis 2 Krebs Cycle 3 Electron Transport Chain

AEROBIC RESPIRATION Step 1: Glycolysis Ø Happens in the cytoplasm Ø 2 ATP’s & 2 pyruvic acids made Step 2: Krebs Cycle § Happens in the mitochondria § 2 more ATP’s made Step 3: Electron Transport Chain o Happens in the mitochondria o 34 more ATP’s are made o Total ATP’s for AR= 36 (two are used up in the process)

PICTURE OF A MITOCHONDRION

ANAEROBIC RESPIRATION Oxygen is not present § Only 2 ATP’s made (from Glycolysis) 2 types 1. Alcoholic Fermentation- done by yeast and other microorganisms 2. Lactic Acid Fermentation- occurs in muscle cells §