The sarcomere is the contractile unit of skeletal muscle fibres. Muscle contraction increases muscle tension. The relationship between increasing ATP concentration and peak muscle tension was investigated. The results are shown in the table. The incomplete graph shows the results of this investigation. (i) Add an appropriate scale to the axes of the graph and draw a line of best fit. (2) (ii) Calculate the gradient of the line of best fit. (1) Answer .......................................................... N per percentage increase

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