how breathing counters the effect of lactic acid on the blood pH?

Question

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Answer 1

During intense muscle activity, much of the glycogen has been decreased and converted into lactic acid (breakdown of stored glucose into lactic acid under decreased oxygen supply - anaerobic breakdown of glucose).

Continued deep breathing afterwards provides oxygen levels required for the muscles to return the cells to their original state whereby creatine phosphate is resynthesized.

During activity, lactic acid lowers blood pH. Breathing expells carbon dixoide (present in equilibirum process with carbonate via acid present) and increased breathing increases the rate at which the pH will increase back to normal through this equilibrium.

Answer 2

Muscles engage in lactic acid fermentation to get energy instead of respiration in the absense of oxygen. When a person breathes they keep oxygen going to their muscles and reduce the amount of lactic acid produced.

Answer 3

If a patient is acidotic (low pH), increasing breathing will blow off CO2, which is acidic.

Basic principles:
Metabolic Acidosis: increased breathing to blow off CO2
Metabolic Alkalosis: decreased breathing to increase CO2 in the body
Resp Acidosis: hold on to bicarbonate
Resp Alkalosis: spill bicarbonate in the urin