Describe the structure and function of the myelin sheath?

The myelin sheath is a fatty substance which surrounds and insulates neuron axons (i.e. it does not allow potassium or sodium ions to pass through it), which allows fast propagation of action potentials along neurones in the nervous system. Action potentials instead 'jump' along the axon, by a process known as saltatory conduction.  This makes passing information in both the central and peripheral nervous system faster and more efficient. 

EC
Answered by Emma C. Biology tutor

16657 Views

See similar Biology GCSE tutors

Related Biology GCSE answers

All answers ▸

Describe how different environmental factors affect the direction of root and shoot growth in plants. You should refer to the role of plant hormones.


What are the 3 main factors affecting the rate of photosynthesis?


What is the function of bile?


Describe the process of inhalation (inspiration).


We're here to help

contact us iconContact ustelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

MyTutor is part of the IXL family of brands:

© 2025 by IXL Learning