Download Anaerobic Fermentation

Anaerobic Fermentation
pg 122­125
3 sources of energy during excercise
1. Stored ATP
­Lasts only 4­6 seconds.
2. Lactic Acid Fermentation
­Lasts up to 90 seconds (sprints)
3. Cellular Respiration
­Lasts as long as oxygen and glucose are available. (Marathon runner­must pace yourself!)
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2 ways to produce energy
Aerobic Cellular Respiration (ACR)
­Requires O 2
­Very slow energy production
­Produces 36 ATP per glucose
Anaerobic Fermentation (AF)
­Doesn't require O 2
­Fast energy production
­Produces only 2 ATP per glucose
Both: produce ATP, and are used inside our bodies to give us energy when needed.
Your body doesn't always get enough oxygen during excercise...
*Body compensates for the lack of oxygen by a process called Anaerobic fermentation that carries out a series of chemical reactions that produce ATP from glucose in the absence of O 2
*Fermentation allows glycolysis to continue making ATP when oxygen is not available for cellular respiration to occur.
*There are two types:
1. Lactic Acid Fermentation
2. Alcoholic Fermentation
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Lactic Acid Fermentation
*Occurs in some bacteria, some fungi, and even human muscle cells.
­Examples:
­Yogurt and some cheeses
­The burn of tired muscles is from the build up of lactic acid.
*Chemical equation (sort of):
C 6H12 O6 Lactic Acid + 2ATP
Process of Lactic Acid in Muscle Cells
1. glycolysis splits glucose into two pyruvate molecules.
2. pyruvate and NADH enter fermentation
3. energy from NADH converts pyruvate into lactic acid.
4. NADH is changed back into NAD+
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Alcoholic Fermentation
*Occurs in some bacteria and yeast
Examples:
­Alcoholic beverages and bread (CO2 forms bubbles that make bread rise)
*Chemical Equation (sort of):
C6H12 O6 Ethanol + CO 2 + 2ATP
(type of alcohol)
Process of Alcoholic Fermentation
*similar to Lactic Acid Fermentation
1. glycolysis splits glucose and the products enter fermentation
2. energy from NADH is used to split pyruvate into an alcohol and carbon dioxide
3. NADH is changed back into NAD+
4. NAD+ is recycled to glycolysis
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