Biology GCSE
Myelin Sheath
What Myelin Sheath means in Biology GCSE, as defined for Pearson Edexcel.
Definition of Myelin Sheath
A fatty layer surrounding the axon of a neurone that acts as an electrical insulator and speeds up impulse transmission.
Topics that use Myelin Sheath
- Topic 2 – Cells and control (Pearson Edexcel GCSE)
Related terms
Using Myelin Sheath in the exam
Definition questions usually carry one or two marks, and examiners look for the precise wording. Write the definition from memory, check it against the version above, and then use the term in a longer answer on the same topic so it sticks.
Practise Biology questions
Create a free account to answer exam-style questions on this topic and get feedback on your answers.
Start free
All Biology GCSE terms7 days Premium · Then free forever · No card, no charge