Lactic Acid Lactic Acid SystemSystem

Lactic Acid System• After 10 seconds, the body’s stores of PC are

depleted and ATP must be re-synthesized using a different source:

The Lactic Acid System

• Fuel = Carbohydrates (C6H12O2) i.e. Carbohydrates, Hydrogen and Oxygen

Lactic Acid System• Carbohydrates are stored in the body as.......

• This is stored in the body in two places -

glycogen

muscles and liver

Lactic Acid SystemGlycogen

Glucose

Pyruvic Acid

Lactic Acid

Energy 2 ATP

Glycogen phosphorylase

Phosphofructokinase (PFK)

No O2

Lactate dehydrogenase (LDH)

Summary• Takes place in the Sarcoplasm• Produces 2 ATP• Is Anaerobic• Enzymes = glycogen phosphorylase

phosphofructokinase (PFK) and lactate dehydrogenase (LDH)

Lactic Acid System

Advantages -more stores of glycogen than PC so lasts longer-relatively simple process , so quick-no O2 needed so no delay

Disadvantages-lactic acid – reduced pH(increased acidity)

= prevents enzymes working = fatigue.

Lactic Acid System