Neco 2021 Biology Question 8

Practice essay / theory question 8 from the 2021 Neco Biology examination. This question covers coordination, nervous system .

Neco 2021 Biology Essay / Theory

Topics: coordination nervous system

Question 8 NECO • 2021 • BIOLOGY • essay

The diagram shows a typical multipolar neuron of the peripheral nervous system.

Question Parts

( a )

State the name of each part that is numbered in the diagram (1‑6).

( b )

Explain, in order, the events that occur from the initiation of an action potential at the axon hillock to the release of neurotransmitter at the synaptic terminal.

( c )

The neuron is 1.2 m long. Seventy percent of its length is myelinated and conducts at 80 m s⁻¹; the remaining 30 % is unmyelinated and conducts at 20 m s⁻¹. Calculate the total time taken for the impulse to travel from the cell body to the synaptic terminal. Show all steps.

( d )

Discuss two advantages of myelination for the overall functioning of the nervous system.

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About This Question

This is Neco 2021 Biology Question 8. It is one of the essay questions from the 2021 Neco Biology examination.

The question covers coordination, nervous system .

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