# Life Sciences Paper 1, November 2024, question 2.6.2(a)

> Study the two graphs below. Use them to describe how the speed of nerve... Marked mark by mark. Q2.6.2(a), Life Sciences Paper 1 November 2024, 2 marks.

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Last updated: 2026-11-12

Subject: Life Sciences. Source: Based on Nov 2024 · Paper 1 · Q2.6.2(a). Marks: 2. Not yet checked by a teacher.

## Question 2.6.2(a) (2 marks)

Two graphs show impulse speed (m/s) against axon diameter (µm) for neurons from a different mammal. Myelinated neurons have axon diameters of 4 to 24 µm and unmyelinated neurons have axon diameters of 100 to 600 µm.

Study the two graphs below. Use them to describe how the speed of nerve impulses in myelinated neurons compares with the speed in unmyelinated neurons.

Figure: Two line graphs side by side. The left graph, Myelinated neuron, has an axon diameter axis from 0 to 25 micrometres and a speed axis from 0 to 100 metres per second, and a straight line rises from about 16 to about 96 metres per second. The right graph, Unmyelinated neuron, has an axon diameter axis from 0 to 600 micrometres and a speed axis from 0 to 20 metres per second, and a straight line rises from 2.5 to 15 metres per second.

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