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