Module 6, lesson 2 cell respiration

Cellular Respiration What we do with our energy

Anaerobic vs. aerobic
Uses no oxygen
Makes a little energy
Uses oxygen
Makes a lot of energy

Overview Of Cellular Respiration
Cellular respiration is the process that releases energy by breaking down glucose and other molecules in the presence of oxygen.
Mitochondria (mainly)
3 phases
Glycolysis*
Krebs cycle
The electron transport chain

To release energy from food molecules and make ATP!
Why do we need ATP?
To run chemical reactions that keep us alive and functioning.
Purpose of cellular respiration?

Summary equation for Respiration

The pathways

Stage 1- The break down of glucose This happens regardless of the amount of oxygen
Glycolysis- Breakdown of glucose in the cytoplasm
Anaerobic
Breaks glucose into 2 pyruvate
2 ATPs required to start the reaction, 4 are produced. ( gain of 2 ATPs )

Glycolysis uses 2ATP molecules but produces 4ATP molecules so there is a net gain of 2 molecules

What if there is no Oxygen?

Anaerobic respiration
Not enough oxygen for aerobic respiration
Fermentation-releases energy from food molecules by producing ATP in the absence of oxygen. (Anaerobic = no oxygen)
Two types: alcoholic fermentation, lactic acid fermentation

Lactic acid vs alcoholic
No oxygen
Occurs in muscles
Pyruvates  lactate
Occurs so muscles can continue making ATP
Get lactate build up in muscles
Causes soreness
No oxygen
Pyruvate  carbon dioxide & ethanol
Seen in yeast and fungus
Used to make beverages, food, makes dough rise

9.2 The Krebs cycle and Electron Transport

Stage 2: Production of ATP
Krebs cycle
Takes place in mitochondria
The Krebs cycle occurs twice for each glucose molecules
Once for each pyruvate
Remember 2 pyruvate =1 glucose

The Krebs Cycle
Aerobic (requires oxygen)
Breaks pyruvic acid down into CO 2 in a series of energy-extracting reactions
Yields 2 ATPs and high-energy electrons for the electron transport chain

The Electron Transport Chain
Uses high-energy electrons from the Krebs Cycle to convert ADP into ATP.
Makes 32 ATP

Overall
Cellular Respiration breaks down C 6 H 12 O 6 .
It produces H 2 O and CO 2
It produces 36 ATPs!
2 GLYCOLYSIS
2 KREBS CYCLE
32 ETC

Comparing Photosynthesis & Cellular Respiration Photosynthesis Cellular Respiration Function Energy capture Energy Release Location Chloroplasts Mitochondria Reactants CO 2 & H 2 O C 6 H 12 O 6 & O 2 Products C 6 H 12 O 6 & O 2 CO 2 & H 2 O Equation 6CO 2 + 6H 2 O -> C 6 H 12 O 6 + 6O 2 C 6 H 12 O 6 + 6O 2 > > > 6CO 2 + 6H 2 O

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Module 6, lesson 2 cell respiration

by CRCourseDev on Apr 18, 2010

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Module 6, lesson 2 cell respiration Presentation Transcript