Scientists investigated the effect of a decrease in pH on muscle contraction. The scientists did the investigation with four different preparations of isolated muscle tissue: A, B, C and D. A- mouse...

A student looked at the results and concluded that a decrease in PH does cause a decrease in the force of muscle contraction. Use figure 3 to evaluate this conclusion.


Extracted text: Scientists investigated the effect of a decrease in pH on muscle contraction. The scientists did the investigation with four different preparations of isolated muscle tissue: A, B, C and D. A- mouse muscle fibres at typical pH of mouse muscle tissue (control 1). B- mouse muscle fibres at 0.5 pH units below typical pH. C - rabbit muscle fibres at typical pH of rabbit muscle tissue (control 2). D- rabbit muscle fibres at 0.5pH units below typical pH. They measured the force of muscle contraction of the muscle fibres at 12 °C, 22 °C and 32 °C Figure 3 shows the results the scientists obtained for B and D compared with the appropriate control. Figure 3 120 Key Mouse muscle fibres 100 O Rabbit muscle fibres Force of muscle contraction/ percentage of appropriate control 80 60 40 10 20 30 40 Termperature/C