No
Date 05 09 2S
Homeosta sis - therequlaton for opthmum
conditions
infernal condtionsforcelis
that
tissves,cells de tecta change in envilonment
heceptors are either organs
temperafure change
from
information receptors, pYocess
coordina
tion centres in brainand spinal chord ecicve
the esponse infomationthen nutiate response. (cNS)
(esponSe
fectocs like muscles and alands produce the
muscles contract restonng op timum
glands release hormone conditon
Things needed kept unde control
to be
blood qlucose concentraton
• body temperature
water levels
• sensory neurones to
carry electucal impulses feom recepfors in sense organs
CNS
relay neur0nes carry electical
impulses om sensory
Devrones mofor euroneS
notor nevrones carry electaalimpulses fom ceatral necvouS Sys tem to effectacs
relay,
neutone
Stimulus eceptof) CNS e fector, 7 (esponse.
sensory nturone motor neulone
Syaapses connectron be tween 2 0euron es
the nerve Signal is transferred by chemials which diffuse acrossfhe q4p
these chemicals set sinal in next oewone
electrical
end
neucone
next down transmSSion 0ervouS
Synapses slow
nevrone impulse as diffusionof chemicals acroSS Jap takes
tine
chemicals L nevrones still
delve fast
nfsmation
celeased diffusing
, No.
Date
reflex an automatic reacfionwith thnking
in alc
• neucones
Pasage ornaton a
reflexis called a
io or nconciouS part braln.
reflexarC qo throuah splnoa chord
Does NOT pass through CNS
STimulus recep tor sensory neuone relay neurone mofor neurone -esponse
efector
A wonman
accidentallytouches hot pan
Describe the
how woman nervous system eoordoates the
s eferaction(6m)
receptor detects stimulus (temp. change )
electicol mpulses pas neuros
along
fom
sensory to relay to motor neurons
Synapses befween neuloneswhece
nosces con tract to pull hand
chenicalscross
34p in spnal ch ord
away
Investigating
reacton time Crequiredpractical
aim
)
to deter mine the efecta pce fctoron humnan reactiontime
) PerSon A holds out hand with
gap whilst Rerson holds rulerwith
at A's thumb
2) Person drops ruler without A
teling
3) The numbe A's
by thumb when gets ecorded
caught
4) Repeat fines and swap tor other person
Control variab
les
Person should USe Same hand to catch ulereachhme
should be
doped fom Samt height
Ensure person tested hasn't had anything fhatcan
being affecttheie
ceaction tne (eg )
cafeine before eperinent
Altermatve Use
computer
Can isSues -
ve precise reacton time
more remoyes humanervor.
. has higher accuracy as can vecord reaction tme miliseconds
remo ves that Can
U Sing computer possibilily person predict when
respond.
Date 05 09 2S
Homeosta sis - therequlaton for opthmum
conditions
infernal condtionsforcelis
that
tissves,cells de tecta change in envilonment
heceptors are either organs
temperafure change
from
information receptors, pYocess
coordina
tion centres in brainand spinal chord ecicve
the esponse infomationthen nutiate response. (cNS)
(esponSe
fectocs like muscles and alands produce the
muscles contract restonng op timum
glands release hormone conditon
Things needed kept unde control
to be
blood qlucose concentraton
• body temperature
water levels
• sensory neurones to
carry electucal impulses feom recepfors in sense organs
CNS
relay neur0nes carry electical
impulses om sensory
Devrones mofor euroneS
notor nevrones carry electaalimpulses fom ceatral necvouS Sys tem to effectacs
relay,
neutone
Stimulus eceptof) CNS e fector, 7 (esponse.
sensory nturone motor neulone
Syaapses connectron be tween 2 0euron es
the nerve Signal is transferred by chemials which diffuse acrossfhe q4p
these chemicals set sinal in next oewone
electrical
end
neucone
next down transmSSion 0ervouS
Synapses slow
nevrone impulse as diffusionof chemicals acroSS Jap takes
tine
chemicals L nevrones still
delve fast
nfsmation
celeased diffusing
, No.
Date
reflex an automatic reacfionwith thnking
in alc
• neucones
Pasage ornaton a
reflexis called a
io or nconciouS part braln.
reflexarC qo throuah splnoa chord
Does NOT pass through CNS
STimulus recep tor sensory neuone relay neurone mofor neurone -esponse
efector
A wonman
accidentallytouches hot pan
Describe the
how woman nervous system eoordoates the
s eferaction(6m)
receptor detects stimulus (temp. change )
electicol mpulses pas neuros
along
fom
sensory to relay to motor neurons
Synapses befween neuloneswhece
nosces con tract to pull hand
chenicalscross
34p in spnal ch ord
away
Investigating
reacton time Crequiredpractical
aim
)
to deter mine the efecta pce fctoron humnan reactiontime
) PerSon A holds out hand with
gap whilst Rerson holds rulerwith
at A's thumb
2) Person drops ruler without A
teling
3) The numbe A's
by thumb when gets ecorded
caught
4) Repeat fines and swap tor other person
Control variab
les
Person should USe Same hand to catch ulereachhme
should be
doped fom Samt height
Ensure person tested hasn't had anything fhatcan
being affecttheie
ceaction tne (eg )
cafeine before eperinent
Altermatve Use
computer
Can isSues -
ve precise reacton time
more remoyes humanervor.
. has higher accuracy as can vecord reaction tme miliseconds
remo ves that Can
U Sing computer possibilily person predict when
respond.
