Edexcel IGCSE Biology 2.88 nerve impulse speed
Practise interpreting neurone data, impulse speeds and response timing from graphs, calculations and method evaluations.
- Syllabus
- First assessment 2019
- Course
- Biology 4BI1
Exam points
- calculate impulse time from neurone length and speed, including unit conversion and standard form
- interpret graphs comparing neurone diameter, myelin sheath and impulse speed
- evaluate reaction-time methods by separating nerve impulse travel from brain decision time
2.88 Nerve impulses and rapid responses question 1
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
Which conclusion is supported by the graph?
A
impulses are always faster in neurones with a myelin sheath
B
neurones always have a myelin sheath
C
wider neurones have a myelin sheath
D
wider neurones have faster impulses
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