Cellular RespirationWhat 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 glucoseThis 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
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 CO2 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
C6H12O6. It produces H2O and CO2
It produces 36 ATPs! 2 GLYCOLYSIS 2 KREBS CYCLE 32 ETC
Comparing Photosynthesis & Cellular Respiration
Photosynthesis Cellular Respiration
Function Energy capture Energy ReleaseLocation Chloroplasts MitochondriaReactants CO2 & H2O C6H12O6 & O2
Products C6H12O6 & O2 CO2 & H2OEquation 6CO2 + 6H2O ->
C6H12O6 + 6O2 C6H12O6 + 6O2 > > > 6CO2 + 6H2O
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