Biology of the Mind- Psychology

3. jyt 177/

, = THESPAIN
C ]
·
[electrical impulses] + glial cells
·

made up of neurons
-


·



PART ONE glial cells support neural cells


fiology of the mind ·


brain plasticity




The Nervous System




a
·


starts
cell body ( the cells life
Support centers

·
neuroanatomy Axon (passes messages away from
cell body to other neurons)
heurotransmittermi he a

through synaptic gap Myelin Sheath /covers axon
of some neurons and helps speed
·
action potential :
a neural impulse Up neural impulses)
a brief electrical
Is charge that
travels down axon and is generated by Dendrites crecieve




·
·

,
messages
the movement of positively charged from other cells]
atoms in and out of channels in Neural Impulse
putenil
i



econ
the axons membrane
down the
·
action potential properties travelling

-



resting potential neurons start out in a

(depolarization
slightly negative charge Crepolarization L ))
=

=
())
-
Grefractory
period
e




-

threshold each neuron receives excititory and

inhibilitary signals from many transmitters when
transmitters reach dendrites. When
Es -

Is threshold =
neuron fires an action potential
all or none response a strong stimulus can trigger
-




+ 48 -
more neurons to fire and increase occurrence of them
↑
,




firing => doesn't effect action potential (CONSTANT)

-
synapse =
·



v




( unction between tip of axon and
·



is a

sending neuron + the denavite/cell body
of
Is the
the receiving neuron .
synaptic cleft
This

Selectric
tiny gar
r 55 - Threshold a

State

>
-

chemical >
-

electric)
hyperpolarization




S
nend
Smi 2
1 3 4

time (ms)
1. action potential stimulates vesicles in
axon terminal to release neurotransmitters


.
2 They cross synaptic gap and bind on to
receptor cites
synaptic

·
re up + ake
cleft
-




,
-
. the
3 neuron either fires or not

## =




⑤ 4
. neurotransmitters are reabsorbed

sites
- by
receptor sending neuron Sreuptake]
transmitter
.


on recieving neuron