complementary cycles. food stores chemical energy chemical energy is a form of potential energy due...
TRANSCRIPT
Food Stores Chemical Energy
• Chemical Energy is a form of potential energy due to the arrangement of the atoms within the molecules.
Accessing the Energy in Food
• Cellular Respiration – a chemical process that uses oxygen to convert the chemical energy in food into ATP.
Accessing the Energy in Food
Cellular Respiration - Aerobic Respiration: requires oxygen
Anaerobic Respiration: without oxygen (fermentation)
Cellular Respiration – The Big Picture
http://www.sumanasinc.com/webcontent/animations/content/cellularrespiration.html
Cellular RespirationStage 1: Glycolysis
•Takes place in cytoplasm•“Splitting Sugar”•Glucose splits into 2 Pyruvic Acid molecules.•2 Molecules of ATP are spent, but 4 are made. (Net of 2 ATP molecules made)•NAD+ picks up e- and brings to ETC.
To
e-
Tran
spor
tPyruvic Acid
Cellular RespirationStage 2: Krebs Cycle
•Takes place in mitochondrial matrix.•Pyruvic Acid molecules lose molecules of CO2 and becomes a new substance (citric acid).•ATP and electron carriers pick up most of the energy. •Electron carriers NAD+ and FAD become NADH and FADH2
Cellular RespirationStage 3: Electron Transport Chain (ETC)
•Takes place on inner membrane of mitochondria.•Electrons picked up from Glycolysis and Krebs cycle are delivered here.•The ETC uses the electrons to change ADP into ATP.•Major source of energy!
Anaerobic Respiration• Fermentation: When O2 is not present,
NAD+ is used in a different way and continues to make ATP through Glycolysis.
Anaerobic Respiration• Lactic Acid Fermentation–Pyruvate in the muscles are converted to
Lactate when muscle cells operate without enough O2.–Fermentation enables glycolysis to
produce ATP as long as glucose lasts.–Lactic Acid build up can cause sore
muscles.