Figure 1 shows the general structure of a neurone.
Figure 1
Identify structure A in Figure 1 and describe how it influences the speed of conduction in the neurone.
It has been estimated that an unmyelinated neurone conducts nervous impulses at speeds as low as 0.5 m s-1 whereas a myelinated neurone can conduct nervous impulses at speeds of up to 150 m s-1.
Using this information, calculate how much faster a myelinated neurone is compared to an unmyelinated neurone.
Identify and explain one key factor which contributes to establishing and maintaining a membrane resting potential of about -70 mV and explain how this is achieved.
Maintaining a resting potential across the membrane requires energy from ATP.
Explain why ATP is required.
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