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, Thwaite
spoken
•
enables reactions to stimuli t
surroundings
Of that exerts control Over all
2
organ systems
•
1
↳ other endocrine ( hormonal )
:
system system
more specific
•
•
rapid •
communicates via
signals through cells +
tiny gaps between them
↳ endocrine uses
purely chemical signals in
circulatory system =
slower
↳
signals : combination of chemical + electrochemical signals
↳ covers
long distances
quickly
acquires info from sensory organs processes it initiates response
• → → a
•
response → motor function =
movement
→
change in
org 's physiological state
mental n e r vo u s
system
CN5
•
•
made up of brain + spinal cord
↳ responsible for
processing info .
Phaethon
meninges
Protective layers
•
3
dura mater
layer
•
outermost
•
tough
•
•
arachnoid mater →
middle layer
•
web like
-
of of connective tissue ,
• consists
layers porous
•
pia mater → inner layer
brain
•
directly covers + spinal cord
cerebrospinal fluid CCSF )
•
in space between pia mater + arachnoid mater
•
brain floats in it
•
acts as a cushion t shock absorber
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