A person who intended to start a fitness programme did some vigorous exercise. A fitness trainer removed a drop of blood from the person's finger before, during and after the vigorous exercise and tested it for lactic acid.
(a)[2]
Explain why the apparatus used for taking blood should be sterile.
(b)[6]
Describe and explain the pattern of blood lactic acid concentration shown in Fig. 2.1.
(c(i))[1]
State the lactic acid threshold for athletes P and Q.
(c(ii))[1]
Suggest a reason for the difference in lactic acid threshold of athletes P and Q.
(c(iii))[4]
Explain the relationship between physical activity and breathing.
Worked solution & mark scheme
This 14-mark question has a full step-by-step worked solution and mark scheme. One marking point: “keeps the sample free from contamination / stops transmission of a (named) pathogen / toxin” …