Practise translating biological graphs into numerical answers by matching the stated condition to the correct curve, reading the scale and retaining units.
Neurones transmit nerve impulses.
The diagram shows a neurone.
Some neurones do not have a myelin sheath.
A scientist investigates the impulse speed for neurones with different diameters. She does this for neurones with a myelin sheath and neurones without a myelin sheath.
The graph shows the scientist's results.
Impulse speed in m per s
A neurone with a myelin sheath has a diameter of .
Use the graph to determine the speed of an impulse in this neurone.
speed = m per s