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AQA GCSE · Question 02.7 · Organisation
Predict the blood flow in a coronary artery with a 35% blockage. Use Figure 3.
Predict the blood flow in a coronary artery with a 35% blockage. Use Figure 3.
How to approach this question
On the graph you have drawn:
1. Find 35% on the x-axis (halfway between 30 and 40).
2. Draw a vertical line up from this point until you hit your line of best fit.
3. From that point on the curve, draw a horizontal line across to the y-axis.
4. Read the value from the y-axis. This is your prediction.
Full Answer
Approximately 24 cm³/minute (accept range 22-26).
To predict the blood flow for a 35% blockage, you need to read this value from your graph. First, locate 35% on the x-axis. Then, draw a line vertically upwards from 35% until it intersects with your curve of best fit. From this point of intersection, draw a line horizontally across to the y-axis. The value where this line meets the y-axis is the predicted blood flow. Based on a correctly drawn curve, this value should be approximately 24 cm³/minute. A small range of answers is usually accepted to account for slight variations in drawing the curve.
Common mistakes
✗ Misreading the scale on either axis.
✗ Providing an answer without evidence of using the graph.
✗ Guessing a value between the plotted points at 20% and 50% without using the curve.
Practice the full AQA GCSE Biology Higher Tier Paper 1
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