Summary Nervous system - Life Sciences (Biology)

The nervous system
Coordination abilitytolinknervoussystemsandtheiractivities sothatthebodysantunctionettectivelyasawnole
Purposeenable
organism tosurviveunderchangingconditionsinenvironment
timulus anychangeinexternalinternal
environment

irritability capacitytorespondtoboth stimuli Characteristicofliving
externalinternal protoplasm

3reauirements
I senseorgans meansofdetectingchangesPicks
receptors
up intoimpulse
stimuli converts
2 Partofbodythatanalysesincomingintoslinksthisintotocertainpartsotbooy ensure


byappropriateresponse
stimulusrecievedistollowed
RECEPTOR NERVEIMPULSE
3 meansofactingoninfolorespond organs musclesglands
erector BRAINISPINALCORD EFFECTOR


NERVOUSSYSTEMEnsuresHomeostasis constantenvironment r
appropriatelytointernal
responds changes fevercrampsheadache coordination
External
changes hotcolddanger
twocontrolsystems
a Nervoussystem bEndocrinesystem
nervouscoordination chemical ofBody
coordination

Pathwayneurons pathway bloodstream



mouseselectrochemical impulsespecialised
ductless
glands h ormones
secrete
chemicalmessengers
rapidresponses madeupotBrainspinal
cord
nervessense
organs slow
responses involve
growthmetabolicchanges




phiggestcelisa
nerve stimulated
easily
millionsofneurons Nervous
tissue
transmitsimpulses
rapidly


088
neurons

nervebundle neuroglia inbetweenneurons
maintain
neuronssupport
vessels
blood
p free
keep
nutrients
from debris
endometrium loose connectivetissuearound
neuronsineach
bundle
perineurium holosbundlesotneurons
together
epineuriummembrane
NervoussystemNs
CENTRALNS PERIPHERAL NS

Brain cord
spinal Autonomic NS
Somagggsystem
voluntary Ginvoluntary
actions

PerineralNERVES cranial sympathetic parasympathetic
1 sensory impulsefromreceptors sensibrainispinalcorolferenal nerve Spegal
oppofadrenalin
12ms 9adrenalin

2 Motor fromBrainspinal
impulses cord Defectors muscle gland fettered prs bourceinnervation


a Mixed Bothsensoryafferent Imoreuletteventfibues

, MOTOR SENSORY CONNETOR

MULTIPOLAR UNIPOLAR MULTIPOLAR



dentrite
d




Mitten
receptor
ma


Mft
cellbofy
i
contains
granular




J
1


iiiii
nucleus
nocentriole anyone o cell
body
central
mitochondria
cto
provide
transmitimpulses




gpÉ
myelin
sheath
fattywhite cellbody
ens
outside
from
neurons eachother
iii indorsalrootganglionswelling
Ieiiiiintigmissiona y
nucleus

axon
impulses
larry away
fromcellbooy axon
toons
impulses axon
knobs
synaptic

y knobs

THEIR

motor away
women senator geniougisememan i ing WMMR syrup
knobs
multipolar havecellbooywithoneaxons unipolarsinge processfibrethat
numerousdendrite dividesclosetoiellbooyintosmain
branshailaxonddenorite
Ionnetor
interneurons sensory motor
How neurons connect lionnectoittipartsotens


Bipolarneurons spindleshaped
Identriteatoneend
end
axonalother
sensory Motor
Brain
White withdenseconcentrationsofmyelinatedfibres
matterregions impulsesReceptors sens tremens effectors
impulsesaway

i afferent
withmostlycellbodies
reymatter regions i efferent
dendrite unipolar
manypenorites multipolar

Bothoenoritesaxonmyelinated
only myelinated
axon
makesuppartotwhitematter parrotwhite Greymatter
indorsairoototnerve inventuatroototnerve

shorter
axon axon
Longer