Summary
Summary Eduqas alevel biology - nervous system notes
- Course
- Institution
Summary notes on the nervous system for A-level biology students.
[Show more]
Seller
Follow
luciacampbell
Content preview
Parts of a neuroneAxon -extensions of cytoplasm that transmit impulses away from cell body
to axon endings.
Dendrites - many thin extensions of cytoplasm that receive impulses from
other nerve cells and transmit impulses towards cell body.
Cellbody/centron- contains nucleus & groups of ribosomes in cytoplasm
that synthesise neurotransmitters.
Synaptic end bulb- swelling at end of axon in which neurotransmitters are
stored
Axon endings - secrete neurotransmitters by exocytosis is into synaptic
cleft.
Only in peripheral nervous system.
Schwann cells-surround peripheral neurones in vertebrates grow around
axon to form multi-layered myelin sheath.
Myelin sheath-formed as Schwann cells grow around axon in peripheral
neurones . provide electrical insulation to speed up nerve impulse.
Modes of Ranvier- intervals in myelin sheath between adjacent Schwann
cells.
Schwann
, Spinal cord
Long thin tubular bundle of nervous tissue & support cells
that extend from the brain.
Protected by the spinal column.
Most peripheral nerves originate from the spinal cord.
Its function is to transmit neural signals between brain and
rest of body, also contains neural circuits than can
independently control numerous reflexes.
Central grey matter contains Sensory fibres from the peripheral
mainly nerve cell bodies. nervous system enter the spinal cord
Surrounded by white matter on the dorsal root and the cell bodies
which consists of nerve fibres of the sensory fibres are found in the
surrounded by myelin sheath. dorsal root ganglia. Motor fibres
Spinal cord surrounded by leave via the ventral roots.
membranes called meninges.
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller luciacampbell. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $7.60. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
67474 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now