From Fish and Amphibians to

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When you are hungry, how do you feel???
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Cellular Respiration
A Chap. 9 Page 220
C6H12O6 6O2 ? 6CO2 6H2O ATP
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Cellular Respiration
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Where does it happen?
?Mitochondria
How does it happen?
?3 Steps . . .
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3. The ELECTRON TRANSPORT CHAIN (ETC)
3 Steps in C.R.

• 1. GLYCOLYSIS

2. The KREBS CYCLE!
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1. Glycolysis

• --Takes place in the cytoplasm of cells
• --Breaks glucose (6-carbon) into two smaller
  compounds of Pyruvic Acid (3-carbon) and produces
  2 ATP

2 pyruvic acid molecules
1 glucose
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2. The Krebs Cycle

• If OXYGEN is present (aerobic) . . .then . . .

--Takes place in mitochondria matrix --In this
cycle, 3-carbon compound (pyruvic acid) and
Oxygen are converted to CO2 , 2 ATP, and lots of
high energy electrons
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Chemically, this is how it all goes down.
Image taken from www.sp.uconn.edu
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3. Electron Transport Chain

• Takes place in inner membrane of mitochondria
• High Energy electrons (from Krebs) are passed
  through a chain producing LOTS LOTS LOTS
  LOTS of
• ATP (34)

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Aerobic Respiration
Cells must contain GLUCOSE, OXYGEN, and ENZYMES...
Summary
...To make ATP, CO2, H2O
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What if after glycolysis, there is NO oxygen????
Anaerobic conditions lead to . . . Fermentation
1. Alcoholic
2. Lactic Acid
No more ATP produced after glycolysis
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Glucose
Summary
Glycolysis
(Net)
2 ATP
Without O2
With O2
Pyruvate
Fermentation
Krebs Cycle
2 ATP
Alcoholic
ETC
34 ATP
Ethanol CO2
Lactate
Aerobic Respiration
Anaerobic Processes
(Produces the greatest amount of ATP!)
(Cells make a limited of ATP)
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Summary
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SummarizingCellular Respiration

• C6H12O6 6O2
• ? 6CO2 6H2O ATP

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Photosynthesis and Cellular Respiration Cycle
Products of one become reactants of the other!
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Comparison of Photosynthesis vs. Cellular
Respiration
Photosynthesis Cellular Respiration
Function Sunlight and Make Glucose Glucose into Energy
Location Chloroplast Mitochondria
Cell Type Plant Cells, algae ALL Eukaryotes, some prokaryotes
Processes that occur Light Reactions Calvin Cycle- (Dark Reactions) Glycolysis or Glycolysis Krebs Cycle Fermentation ETC
Equation 6CO2 6H2O C6H12O6 6O2 C6H12O6 6O2 6CO2 6H2O
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How much energy do we make?

• In Cellular Respiration
• Anaerobic
• Glycolysis- 2 ATP
• Fermentation- 0 ATP
• Total- 2ATP
• Aerobic
• Glycolysis- 2 ATP
• Krebs Cycle- 2 ATP
• ETC- 34 ATP
• Total- 38 ATP

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How do WE use Cellular Respiration?

• Quick Energy
• Enough ATP to last about 50 meters in a race.
• Lactic- Acid Fermentation takes over to produce
  energy
• Produce energy for about 90 seconds.
• Long-Term Energy
• Exercise longer than 90 seconds
• Extra energy stored as carbohydrate glycogen for
  15-20 minutes of energy
• Longer exercise body breaks down other stored
  molecules- mainly lipids.

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VIDEO of CELLULAR RESPIRATION

• http//www.youtube.com/watch?vfvgpf51ScuI