Asked to name a type of neurone, a candidate answers 'myelin neurone'. What is the error?
AMyelin is the correct name for a motor neurone
BMyelin neurones exist only in invertebrates
CMyelin is a neurone found only in the brain
DMyelin is a sheath around a neurone, not a type
Answer & Solution
Correct answer: D. Myelin is a sheath around a neurone, not a type
1. Neurones are classified by the direction they carry impulses: sensory, relay and motor.
2. Myelin is not one of those categories at all.
3. It is a protective, insulating sheath that surrounds the fibre of a neurone.
4. So 'myelin neurone' confuses a covering with the cell it covers.
5. A neurone may be myelinated or unmyelinated, but the myelin itself is never the neurone.
_Source: NECTA ACSEE 2022 Biology 133/1, Question 3: Coordination_
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