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 Form 2 Biology respiration questions and answers

The concentration of the lactic acid in blood during and after an exercise was determined. The results are shown in the graph below.
figrespiration12620201424.JPG
(a) (i) By how much did the lactic acid increase at the end of 13 minutes?
(ii) After how many minutes was the lactic acid concentration 71mg/#100cm^3#
(iii) What would be the concentration of lactic acid at the #60^(th# minute?
(b) Give a reason for the high rate of production of lactic acid during the exercise.
(c) Give a reason for the high rate of production of lactic acid during the exercise.

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