Lactic Acid System

Revision notes on the lactic acid system for A2 Physical Education - Exercise Physiology

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  • Created on: 10-01-08 13:01
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The Lactic Acid System
Site of Reaction ­ Sarcoplasm
Presence of O2 ­ None
Fuel Used ­ Carbohydrates, Glucose, Glycogen
Active Enzyme ­ Phosphofructokinase, Glycogen Phosphorylase, Lactate
Speed of Reaction ­ Fast
Threshold ­ 12 Secs ­ 2 Mins (Depending on Intensity and Fitness)
Biproducts ­ Lactic Acid, Pyruvic Acid
Effects of Biproducts ­ Lowers PH in muscle (More Acidic) which prevents
enzymes from working so glucose and glycogen cannot be broken down. Results in
Fatigue & Muscle Spasms
Energy Yield ­ 1 Glucose Molecule: 2 ATP Molecules
Enzyme Inhibited by Increased acidity in muscle cell, Increased levels of
Enzyme Activated by ­ Decrease in Phosphocreatine levels

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The Glycogen molecules are broken down in the same way except the Gycogen is
broken down by the Glycogen Phosphorylase into Glucose ­ 6 ­ Phosphate.
Gycogen then follows the same route as Glucose.
Practical Application
The 400m race is a good example of the possible effects of using the Lactic Acid
system.…read more


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