Complete AQA A Level Biology notes on nervous coordination and muscles with diagrams, definitions to support your understanding.
Details include:
Myelinated motor neuron
Resting and action potential
Speed of nerve impulses
Synapse
Inhibition
Muscle structure
Sliding filament theory
Typ...
Myelinated Motor Neuron
Sensory Neuron
0
I is A E
CellBody Relay Neuron
RERtranslation
andangit
Mitochondria I 0
Dendon
toward
Impulse
cellbody
axon immuneia p
ryong
Nucledous Nucleus Myelinsheath
inffonsoffffakngaam transcriptionfor
neurotransmitters
whichareproteins Schwanncell
Protectaxon and
provideelectrical
insulation
Phagocytosis removal
debris
of
principles of Coordination
HormonalSystem Nervous System
Communication communication
by hormonesCchemical by nerveimpulse
Transmission transmission is
bybloodsystem byneurons
Slowtransmission Rapid transmission
Hormonestravelto all parts ofbody Nerve impulses travel to specific
butonlytargetcellsrespond partsof body
Response is widespread Response localised
Slow long lasting Rapid shortlived
Effectmay be permanent and Effectusually temporary and
irreversible reversible
, esb bl
Resting Potential
Nat1kt pump uses ATP to actively transport 3Nat out and 2kt in
Channelproteins in themembrane allowdifferential diffusion ofand alongtheirrespective
concentration gradients
3 things established
70mV internal charge
Highcone of Nat outside
Eakraudfenchyemical
high conc of Kt inside
Action potential
Atresting potentialsome Ktvoltagegated channels are opened butNatclosed
Energyfromstimulus opens Natgates so Natdiffuseintoaxon along electrochemicalgradient
Knockon effect on other Natgales
Once reach 140mV Natgates close and more k ion channels to open
polarisation astoo much Ktmoves out
Hyper
1ktpump removes 3Notfromaxon and 2kt back intoaxon toachieverepraisation as the
Nat
closable gates on the K ion channel nowclose so more Ktions stay in axon
RestingPotential ActionPotential
140 Actionpotential
Natvintage
gated closes
channel
Nat c hannel close
3
fafffiaoteanadtmbdion
letuntagegatedchannelopens
down
one
g radient
open
Eggo
bo
from
stimulus
1voltagegated
inane
your receptors
yo Natha closes
pump
Natchannelopen
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