Physiological Responces sections
NERVE IMPUISES
structure of neurones
engin of accont polorized
usdechageMat enabler nevons to carry electrical impuses
nature of the newore membrane in its
testing
asa
state
.
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RESTING POTENTAL
-Peripheral ht
·
EXTERNAL + INTERNAL STIMUli RESPONCES
nervous
-
> :
organisms increase their chances -
system .. inside =-
survivalof
environmental
by responding to .
S g ·
uses voltage
- due to polarisation theres a 1 in voltage across
changes
anmumbrane mot
- linked Nat
homeostasis an ability maintainaconstantintunaenvironmentdespite
: -
D a
externali n e a sy
· Channels
3
Fut
-
: 21 into accon
·
set point
internal factor
: levelled va l u e which a
conditions within
hey indecator
organisms that
must be
must be maintained
maintained at for heathly functioning + survival
synapse ,
neuronansmitter -
decrochemicalgradient can
,
e
for health
receptori na
:
. Nat for 24 using ATP in AT
·
+
-
3 .
factor infuences which may act to jepordise GENERATOR POT
·leternal
: homeostas a
-upon stimulation the ancon becomes
.
:
detectable changes in the environment ·
cenwal nevous
depolarized be neurone excites due to resting a
Potential Raya
complexer that repolarisation
Stimuli
identify
·
·
receptor R. system Shimur > Nat channels to open
-
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atferentpathwaymessagewhichgeommruointegration+
&
·
·
voltage linked ↑ permeability to Nations , so Nations differe
Presen Nat channels
-
sends messages along a
Potentionenemagradiens a a
-
efferent pathway message from the integration centre to effector
F point of depolarisation
syn
·
:
Action ·
at the
·
effector :
target organ that recieves efferent messages + carries out responses in
musles/glands neuronansmitter
· channels open >
-
p d of
. home- a local current of Nations is
carried out deal with inital stime , muscle contation
~
action levent Nations
/gland scretion. . Ther
to
·
response : created
fast Rapid , short lasting , hansifted all or nothing Nat channels close +ht channels open as It to allow
specific t v diffuse sideways
HYERPOLARISATION
-
·
nerves : electrochemical messengers along new ores that are
out it reduces me p o value , but
,
diffuses + open
.
move
normones : chemical messengus proteins/steroids Slow , delayed , long lasting conc
dependent in blood widespread peripheral Local current to
·
+
-manyamps
· , ,
·
tascis : directional movements in response to stimulus towards it ① nervous
o re Nations ona a
system wave of depolarisation
·
henesis : movements in random directions in respone to unfavourable conditions
inherita ora
reaction parkway I uses voltage
REPOLARISATION
·behaviouranyresponsi+ potential to allow completion of a n imprise
:
chances et survival
·
innate +
-
,
optimum level linked Nat continue me wave' of depolarisation .
stimulus Channels
: gravopisgwinresponso
gravia rors) producto Lips
receptor
afferent sensory msg
by shoot in response tolight controller Factors effecting speed of conduction
efferent motor msg
effector ↑
Snucture
oa
myelinata
time
--
response DESCRIBE EXPLAIN
nari
Feedback loop
um vanition
INVERTABRATES v
·
simple animals respond to stimul in the environment by tascist henesis
Imperature IN HIBATOR + EXCITORY
· t a i d animals to escape predators find food locate habitats
they are involuntary movements , ,
ascon wider = sistance +
Tanistastertdiretegigdandimanwicmonaway might auneganveas,
↑ diameter , t speed
O friction for
d i am e -
sideways
· ins
s
stay So where be favourable conditions I
01
they are .
humidity move fast + tur n us
distance for impulses to
Salvatory
TROPISMS + FLOWERING PLANTS conduction.
as
- engin of the accon : Slower + Ap
photonopism
qualdistributionofFocused bylight is the
caused by
: une gray
+ I
-gravinopism
B SYNAPSES
↑·
IAA stinutales shoot
:
high growth + inhibits root growth
2
helpsswvivala FAA is made shoot Neuromuscular junctions
by lips by moves down shoot by diffusion
#
·
grow towards light Synapse = the junction between 2 neurones
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ForPhotosynthesi s
absord 20 + minerals
apimpbbnep ~ myelin
sheath
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nest receases newon harmites
-phototropism newomansmither : chemical that diffuses across synaptic cleft to transmit
+
gravitropism electrical impulse to post S N .
-
Lower side
EXPERIMENTAL EVIDANGE FOR AUXINS +TROPISMS
newasher
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·
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acetylcholine is contained
that more towards Pres M + use
=>
.
to release acetylcholine mycribri
·
micaprevents
is auxins
moving down synaptic cleft
arrives
potential
action
1 at motoreda a
·
auxins from the blocks cause complimentary receptors 2
potential is created plate
+
s action .Ca
3 diffuse into the motor newone end
.
4 vesicles containing accrylcholine migrate + tuse
- acetylcholinesterase is
with the pre-synaptic membrane .
5 accrylcholine is released by exocytosis
.
6. accrylcholine diffuses across cyet and binds to
R ECEPTORS So A P can . repolarize
>
-
receptors on the Sarcolemma
Nat channels open on sarcolemma
.
. Nat
8 diffenses into muscle fibers : Sarcolemma
Stimuli
-
products of acetylcholine
specific stimulus-electrochemical energy used
detect and are
deppowithtransmitted down T-Lubes
receptors t convert
:
they ,
energy from in neurones ->
impuses is reabsorbed into pre S M . .
a .
outside receptor 10 .
Sarcoplasmic recrilium depolarises and releases
HOW DO RECEPTORS WORK ? cal+ into sarcoplasm
ECF
SYNAPSE FUNCTION Muscle contac ts
energy causes stimuli linked Nat channels to open and Nat more into receptors by
i
11 .
I . Stimulus .
facilitated diffusion ① unidirectional wansmission pre-post
.
2
if stimulus energy isn't strong enough , enough Natchannels open to build a 2 temporal summation , weal stimuli doesn't release enough newowansmitters are pleased > depolarisation
spartial us -
generator potential that breaches threshold level of depolovisation
enough c a n be made by : Temporal = 1 newore stimulated repeated or spatial : several new ores combine
.
3 nothing response Voltage linked Not channels open Not more into receptors cause depolarisation > Action potential Inhibitory synap a s cause
3 excitory vs inhibition newotransmitters. exitory synapees
all or . ... more -
.
by facilitated diffusion (further depolarisation ( hyperpolarisation by
+
GABA :: prevents A P and causes h /Cl-channels to open
.
action potential made ,is ransmitted to and carried
4.
by
s ensory nurones as neve impulses
↳issummuntiyjntmna
-
ShELETAl MUSCIES
-
·: game
action potential I 2
a
m must sinning antagonisticpairs muemapinopposite directions,s
past a
-
·
Nat channel V .L
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E
+
muscles act as antagonistic pairs against a n incompressible sheleron
Dils i)
I
·
each neworansmis Sion junction connects to > 1 music fibers -6 mysfibiils
sim
-
I
·
-
-
.
7 motor unit = groups of muscle fibers connected to same motor neurone
I
·
.
·
+
piasm
only A
·
O oo
O
Nat Microscopic muscle structure
I
-
low
- cytoplasm concentration 7
time
receptor generator potentials
membrane has
resting potential NERVOUS COMMUNICATION
a
Sacomees
nation
PACINIAN CORPUSCLE -
concious
I
Slow or fast twitch muscles
pin ·
Stimula ·
slow:specanized for slow contractions
and are adapted to
long perioder
A in contaction of excercise as they don't fatigue
~
region
micic
sarcomere shorter
Features
-
unconcious :
Earned r.
-
-
Al exciandnava
log
fast 12 Synapes + 1 neurotransmitter junc
ent
· tion SLIDING FILAMENT THEORY
Shearh of S N . and 3 neurones no change
·
short-lived blood vessels + Lots of Mitochordia
Sig potential
Localized 1 when an action arrives at a NMJ
fast : adapted to release energy quickly
-
aplasmic r liumdelarisandrassat
a
·
into scrops
-
autonomic (no decisions made , protec + is s ? during intensive exercise. Thick
-
aids survival
4. me myosin binding sites on actin
this exposes myosin filaments , high conc. glycogen
potential transmitted and lots of
hydrolysed enzymes for
action S N to CNS
as neve impube along Pi to release energy that's used to anerobic
·
tip is by Alpase > ADP +
. .
.
5
-
RODS + CONES -recoch' myosin head-recovery stone respiration and store of phosphocrea
tin so ATP can regenerate
6 myosin head binds to actin filiment using Aip- cross bridge
-
- myosin headcasesAt
.
·
highlighteninymanprtorsndeeighinensis
pulling actin fillment oor a
·
=>
S
9. acrin myosin cross-bridge -
breaks
·
the remind at me back contains
of the
eye photoreceptors (rods/zones) detects light
of Cat and ATP in muscle contraction
t
how do photoreceptors work ? Roles
lightsensitive pigments : rods (Rhodopsin) and Comes (lodopsin) ca?
"
·
photoreceptors contain =
: Calt is released by sarcoplasmic recilium into sarcoplasm
when pigments absorb light, they undergo a chemical change called bleaching
pomyosintomoves
ca'+ bin
·
a a
expoetoroponinandcause
on
·
during this reaction energy is released providing a stimule to increase the permeability acrin to
of photosystem membranes to Nat
+actin
formation between myosin
Sodiumiontokupogedbymeshdramedstay
va n
·
and to the brain
newone to optic neve
optic neve
= nee
emai
RETINA
Lots
CONES
i
RODS
s arcoplasmic few
recrilium
Light
Como
Libers dorn
apper an ce
diagram I synapses
diameter minne micher
distributed concentrated in the torea
distribution evenly
on the peripheral sparsely found
in peripheral
revina
on
pariso theren, is
sensitivitighvi e
, absent
partsofretina
om is mechanism that amplifies a change away
positive feedback = a
forea
insensitive
+ blind spot
to colour ensitive ourtype
a
HOMEOSTASIS ·
from me normal level ( not involved in homeostasis)
gives a rapid activation of a process (labow) + associated
in me CSM
or
colour I black and while w i l a breakdown of control systems .
Light
time of day used for dayvision involves maintain internal environment within restricted limits
used for night vision homeostasis = a physiological control systems mat
connectivity many rodsjoin to one each cone joins to one bo
a
↳ Vital for cells to l i s t -
> enough ATP avoid
to damage + enzymes remain at optimum conditions
neurone
Light sensitivity ② stimulus-change
sensitivity
Drama a
Low
high light sensitivity increase in BGC
Response to an
acuity low visual acuity high visual acuity
langer hands
↳
defeated by B cells in the pancreas islets of
· : less maina = Bceus secrete insulin
compliment, i s
high light intensities
light intensitis
low in
-
·
more control 3-
bloodguecoebybinding
insurances
to
pigment bleaches even i n
-
·
types of control 4 more guico se carriers placed into plasma CSM
dim
several rods
Light
with
only bright light T HE HIDNEYS funcion of me hidneys : excretion of area reversedina =temperatu
a 5 more guicose entus a l l by facilitated diffusion
synapse
·
avaenmm
on e cone
synapses osmoregulation - mis
one bipolar neurone so with one bipolar = pu , vol , pressure of blood
-
blood guelose
containse
ession ↳
many weak generator new one so
-
water potential
potentials combine to reach
generator J
potential must reach
is
striggean ai
rations pancrea
thresholdalon
a Response to a decrease in BGC
&
low
several rods
visual acuity
synapse with
Dipolar neurone
↳ deepanrasistlageman
-
see
highVisuaatten a receptors on liver cells
newnessobranas
bipa 4
·
to stimulate
activating enzymes
-
-glucose)
guconeogenes agycogen
rod light falls upon atty ↓ acids + amino acids + glycol
brain can tell whee
>
-
to glucose
indistinct images tell + distinct image
Light
1. ultrafiltration The role of adrenaline :
CONTROL OF RATE >
- myogenic a
conro ·
secreted
by adrenal glands when BGC ↓ below normal , stess + exece
pion
2 adrenaline
.
cycle
binds to its
complimentary receptors and activates
1 as the
left ventricle contracts ↑ hydrostatic pressure adenylyl cylase enzyme in liver cells
.waeandalso
2
plamcomponent
gomea b
3- activated adenyly cylase converts ATP into AMP and CAMP
aa
-Campasasodaymessengemaiacivares
n
protein
sends impuses and epimeli of ponocyte to form filtrate
LacavaPulmonary
which spread a
base,memsmasuaristmansst
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Sladrenaline Inday Messenger
,
through me
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have + guylogen same
arria : sincatrial waves of depolarisation
stimulate contraction
.
arria sysole
.
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Stimulus
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-initi
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ascending
Limb = more limb = impermeable
CNS
motor N
sympameric motor
medura oblongara
parasympathetic m o to r
①
has LionSJ/T longer the loop ofh eute binds to receptors and actives the
6 the enzyme
SA node receptors SA node receptors
pini
deeper into the meduled
effectors ↑ depolarisation ↓ depolarisation
3.
inDNatitea me more icns
AT out o AL
must
-
in
rom me s
medulla
sent to Avnode :. 4HR sent +o Avnode :: NHR
highest