Summary
Summary Alevel OCR Biology A notes on Neuronal Communication
Alevel OCR Biology A notes on Neuronal Communication from an A* Biology student. Plus diagrams.
[Show more]
Connected book
Book Title:
Author(s):
- Edition:
- ISBN:
- Edition:
Seller
FollowContent preview
mentrinsk out
t
④ repolarisation
Neuronal Communication
-sensory rarores reception to CNUS
-
-relay namores: CNS,
in connect motor sensory
-
CNS
motor- effectors
to
Pacinian
-
corpuscles mechanoreceptor deep
=
slim,
in respond to changes in
pressure generator potential
-
=ends of sensory remove axons
-many layers of membrace separated by a
gel (concious Nations)
-stretch mediated Nat channels open with enough pressure NA"=
influx = electrical potential
difference established generator potential (depolarisation
-
-
resting inside
axon= always
axon=
regative electrical potential:
resting potential
difference -70mV
-
potential
=
of
-
Na-K ATP 3 for 2 hic transpared in electro-
pups be
actively transport
to Na icry out axon
every
-
cherical gradient
Nat letmore
-
selective protein channels membrane by facilitated diffusion
=
+ across
↳ Nat=
ls permeable to k tdiffuse back down core gradient
+
at of axon 4
distribution of electrical charge
-
action potential brief change in
I
-rapid movement of Nat netacross
+
axon membrace
-voltage gated channel protine open/close
=
via electrical politic, closed during lost state
N at
stimulus- Natdiffises
channels open- to
in electrochemical gradient
-large enough stimulus delected by remore action
-
potential
-
=
55mv depdarisation.
depdcrisation -55mv, =
voltage gated Nat channels open. Nat with axon=↓
potential difference
↓
midirection al inside of axon becomes less regative:more channels open: ↑ Nat enter (posite (eed)
=action potential -> 30mv
+
repolarisation:
all Nat voltage
galed channel proteins close + k voltage galed charrels opel=
-
↳ ditases our of axon retur n
=
polental die to -70mV
hyperpolarisation:a tchannels slow closet
to too
may
bediffuse o u t :
potential dif=Pregative
i tchannels close, Na-h purp
resting polental: restores resting potential
is
-> preciate section mopasie
-action potential triggered neurore
in
depolarisation:Nat
= Nat instux=action
charrels open: potential (discrete +
midirectionals
-All nothing principle-stimulus:strong enough to i above threshold
or receptor potential potential:stimulate
semary remove to
send impulses
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 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 lottiemcgowan1. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for £3.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
75057 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy revision notes and other study material for 14 years now