MYTUTOR SUBJECT ANSWERS

271 views

What is the myelin sheath?

The myelin sheath is a layer of insulating, fatty material that encases some neurones. The sheath is composed of Schwann cells that have gaps called nodes of Ranvier between them. Potassium and sodium ions can only diffuse in and out of the neurone at these gaps. This allows saltatory or 'jumping' conduction where the local currents are elongated as the sodium ions have to diffuse further along the neurone before the action potential can occur. The action potential appears to 'jump' from one node of Ranvier to another.

Alice H. GCSE Biology tutor, GCSE Chemistry tutor, GCSE Maths tutor, ...

9 months ago

Answered by Alice, an A Level Biology tutor with MyTutor

Still stuck? Get one-to-one help from a personally interviewed subject specialist

129 SUBJECT SPECIALISTS

£20 /hr

Sally P.

Degree: Biological Sciences with industrial placement (Bachelors) - Exeter University

Subjects offered: Biology

Biology

“Hello! I am a second year at the University of Exeter ”

£24 /hr

Moonisah S.

Degree: Neuroscience (Bachelors) - Bristol University

Subjects offered: Biology, Science+ 2 more

Biology
Science
English
Chemistry

“I teach the core subjects but specialise in science. I am here to help you achieve your goals, evolve as a learner and hopefully develop a love and appreciation for your subject.”

£20 /hr

Emma W.

Degree: Natural Sciences (Bachelors) - Durham University

Subjects offered: Biology, Physics+ 2 more

Biology
Physics
Maths
Chemistry

“Hi! I'm Emma and I'm a second year Natural Sciences student from Durham University, which means I've studied biology, physics and maths at university level. I have a very friendly tutoring style as I believe students are most able to ...”

About the author

Alice H.

Currently unavailable: for new students

Degree: Biology (Bachelors) - Bristol University

Subjects offered: Biology, Music+ 2 more

Biology
Music
Maths
Chemistry

“I'm a Biology student at the University of Bristol who is passionate about both science and music having studied them at A level. I would love to help anybody who is struggling with specific concepts or just needs someone to guide the...”

You may also like...

Posts by Alice

What are the methods of immobilising enzymes?

What is the myelin sheath?

What is tonality?

Other A Level Biology questions

What is an enzyme and what effect does temperature have on enzyme activity? (6 marks)

A guanine is swapped for a thymine in a gene sequence. Explain how this may alter the function of the protein it translates.

How are Genes and DNA organised?

What's the difference between the cell wall and cell membrane?

View A Level Biology tutors

Cookies:

We use cookies to improve our service. By continuing to use this website, we'll assume that you're OK with this. Dismiss

mtw:mercury1:status:ok