Cellular Respiration & Fermentation: Ch

Objectives 1.Importance of mitochondrion’s structure 2.Inputs & outputs of cellular respiration 3.Anaerobic vs. Aerobic conditions 4.Importance of fermentation; when/where it occurs

Transfer of Energy

We Need Energy! All living things need energy. Forms of Energy: 1.Food = chemical energy 2.ATP = cell energy Cells make energy in 2 ways: Photosynthesis: takes place in chloroplasts Cellular Respiration: takes place in mitochondria

Mitochondrion Ideal place to make energy. Why? Structure is key. What do you notice? Many folds --> large surface area –allows for a lot of ATP production

Inputs vs. Outputs in Cellular Respiration Inputs Outputs Cellular Respiration C 6 H 12 O 6 + 6O 2 ---> 6CO 2 + 6H 2 O + ATP (Energy!) Glucose + Oxygen ---> Carbon Dioxide + Water + ATP (38) Is cellular respiration aerobic or anaerobic? Cellular respiration is aerobic: requires oxygen Aerobic. Why?

The End Product The result of cellular respiration is the generation of ATP 1 molecule glucose --> 38 molecules of ATP! This is what keeps us alive! 38 ATP

Cellular Respiration: the relationship to breathing

No Oxygen? Do all cells need oxygen all of the time? Anaerobic environment: –w/o oxygen What are some examples? Sprinting

Fermentation Fermentation: –Makes ATP w/o using oxygen Sprinting –Lungs and blood can’t supply oxygen fast enough to meet muscles needs –Body resorts to fermentation for short bursts of activity What happens?

Feel the Burn! Fermentation in a muscle cell produces a waste product called lactic acid --> burns! Buildup of lactic acid causes soreness during and after exercise Body eventually converts lactic acid back to pyruvic acid

More Fermentation Yeast (microscopic fungus) cells: In anaerobic environment it produces alcohol and CO 2 --> beer Makes bread rise Sharp flavor of cheese –Due to lactic acid

Fermentation performed by Muscle cellsBacterial fungiyeast Lactic acid Ethyl alcohol CO 2 Sore musclesSour/sharp tastebubbles produces produces & releases that in the body causes that in food causesin bread causes