Cellular Respiration

Vocabulary Calorie Glycolysis Cellular respiration NAD+ Fermentation Anaerobic Aerobic Krebs Cycle Electron Transport Chain Vocabulary

How do you feel when you are really hungry?

Chemical Energy and Food Food provides organisms with energy 1 g of sugar = 3811 calories of heat energy A calorie= amount of energy needed to raise the temperature of 1 gram of water, 1 degree Celsius The Calorie on nutrition labels is a Kilocalorie How do we covert food into energy? Chemical Energy and Food

Process that releases energy by breaking down glucose and other food molecules in the presence of Oxygen. Cellular respiration

Brainpop

Cellular respiration- 3 Main Stages Glycolysis Krebs Cycle Electron Transport Chain Cellular respiration- 3 Main Stages

#1 One molecule of glucose is broken in half, producing two molecules of pyruvic acid (a 3- Carbon compound) Occurs in cytoplasm, requires some energy from cell Net gain of 2 ATP molecules Happens Fast Requires no oxygen Next step: Fermentation or Krebs Cycle Glycolysis rap on youtube Glycolysis

If No Oxygen is present… #2a FERMENTATION Fermentation releases energy from food and makes ATP without oxygen= ANAEROBIC 2 types of fermentation—Alcoholic and Lactic Acid If No Oxygen is present…

Alcoholic Fermentation Yeasts and other microbes carry out alcoholic fermentation Pyruvic acid + NADH  alcohol + CO2 + Nad+ Fermentation Demo 2g yeast, 2g sugar, 50ml water into a balloon. Tie balloon and wait a day or two. Alcoholic Fermentation

Lactic Acid Fermentation Used by organisms other than yeasts and microbes Pyruvic acid + NADH - lactic acid + NAD+ Lactic Acid Fermentation

Lactic acid is produced in your muscles during rapid exercise (limited oxygen present!) Your muscles quickly run out of oxygen when exercising strenuously Lactic Acid is produced and builds up causing pain, fatigue Lactic acid

Think of a time when you may have experienced Lactic Acid Fermentation! Lactic Acid Video Clip

Krebs cycle—Oxygen PResent If oxygen is present at the end of glycolysis, cellular respiration moves to the Krebs Cycle With oxygen= AEROBIC Pyruvic acid is broken down into carbon dioxide and energy! High energy electrons are passed onto the Electron Transport Chain… Krebs cycle—Oxygen PResent

Electron transport chain #3 Final step of Cellular Respiration Uses the electrons produced in the Krebs Cycle to covert them into ADP and ATP. LOTS of energy is created! Electron transport chain

Glycolysis-2 ATP molecules Krebs + Electron Transport Chain= 36 ATP molecules Energy Totals

Wrap it up video review

Cellular Respiration FlowChart Handout…tape into notes biology corner Cellular Respiration FlowChart

Feel the burn Quick lab activity (from Dana) Clothespin, open/close for 1 min, then 2. record # of times. When did you swtich from aerobic to anerobic? Feel the burn