Cellular Respiration

Definition: Decomposition pathway that provides the energy cells need to function Each step is enzyme catalyzed

Cellular Respiration Can occur aerobically or anaerobically Aerobic=requires Oxygen Anaerobic=absence of Oxygen What do we make we anaerobic respiration?

Aerobic Respiration

Stages of cell respiration Glycolysis Krebs Cycle Electron Transport Chain

Glycolysis Breaks Glucose into pyruvate Happens in the cytoplasm Reactants Glucose (6 carbon) 2 ATP Products 2 pyruvate molecules (3 carbon compound) 4 ATP (Net=2ATP) 2 NADH

Glycolysis

What is NADH anyway? Just a molecule NAD gets reduced and gains an electron (H) becoming NADH Don’t worry too much about it A molecule that has the potential to make ATP

Kreb’s cycle Occurs in Mitochondria matrix Breaks down the pyruvate from glycolysis into CO2 Reactants: Pyruvate End result for one glucose molecule is 2 ATP 8 NADH 2 FADH 2 6 CO 2

Electron Transport Chain Occurs in Inner Membrane of mitochondria Uses NADH and FADH 2 from Glycolysis and Krebs to create ATP Reactants: NADH and FADH 2 and O 2 Each NADH=3 ATP Each FADH2=2 ATP Products: 34 ATP and H 2 O

Purpose of cell respiration To break bonds in Food (stored energy) and create ATP (usable energy for cell)!