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OCR Biology A-Level Neurones Summary
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Handwritten Notes detailing all the necessary A* content for Neurones in OCR A-Level Biology.
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structure of Neurones :·
Cellbody
:
Contains the nucleus and cytoplasm has ,
lots of Mitochondria and RER to
produce neurotransmitters
·
Dendrons :
short extensions that divide into dendrites s transmits electrical impulses
Axons Nerve:
fibers that transmit impulses away from the cen body
Types of neurone :
Sensory Neurone Transmit impulses from cell to
relay/motor brain
sensory neurone or the
a a
:
myheath Node of Ranvier
Motor Neurone Transmit from
neurones
relay/sensory to effector
:
a neurone an
mychneath Node of
Ranvier
Many
Relay Neurone :
Transmit impulses between neurones
myclin sheath
Many layers of plasma membrane
acting as an
insulating layer allowing
:
electrical impulses at a much faster rate
Node of Ranvier Gaps in the myelin
:
sheath that allows the electrical imprises to jump
↳ much faster transmission
Multiple Sclerosis Autoimmune disease that causes the
:
bream down of the
my clin sheath
Pacinian Corpsucle Sensory receptors in the swin :
↳ Pressure on the corpsucle distorts the membrane , widening the sodium ion channels
↳ Depolarisation causes generator potential
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