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Ca
+
Sodium-
dependent
noradrenaline
transporter
Tropomyosin
alpha-1 chain
Tropomyosin
beta chain
Beta-1
adrenergic
receptor
Voltage-
depenent L-type
calcium channel
Voltage-
depenent L-type
calcium channel
Voltage-
depenent L-type
calcium channel
Ryanodine
receptor 2
cAMP-dependent
protein kinase
type I-alpha
regulatory
subunit
Synaptic
vesicular amine
transporter
Sodium-
dependent
dopamine
transporter
Voltage-
dependent
P/Q-type
calcium channel
subunit
alpha-1A
Voltage-
dependent
N-type calcium
channel subunit
alpha-1B
Sodium/calcium
exchanger 1
Voltage-gated
T-type calcium
channel (ICaT)
Voltage-gated
T-type calcium
channel (ICaT)
Dopamine beta-
hydroxylase
Sarcoplasmic/endoplasmic
reticulum
calcium ATPase
2
cAMP-dependent
protein kinase
catalytic
subunit alpha
Dopamine
Ca
+
Norepinephrine
Norepinephrine
Ca
+
Norepinephrine
Norepinephrine
Dopamine
Dopamine
Ca
+
Ca
+
Ca
+
Na
+
Na
+
Ca
+
Ca
+
Ca
+
Dopamine
Ascorbic acid
O
2
Dehydroascorbic acid
H
2
O
ATP
H
2
O
Ca
+
ADP
P
i
Ca
+
Pyrroloquinoline
quinone
Copper
Ca
+
Troponin
Troponin
G-Protein
Signaling
Cascade
Muscle
Contraction
Cytosol
Postganglionic Neuron
An increase in dopamine
causes an increase in the
sythesis of Norepinephrine
The inhibition of
norepinephrine reuptake
receptors by Dopamine causes
more norepinephrine to
accumulate in the synapse,
causing the continual
activation of the beta-1
adrenergic receptor
When the neuron fires, the
accumulation of
norepinephrine synthesized
from dopamine, as well as
norepinephrine already
stored in the sympathetic
neuron endings is released
into the synapse
Synapse
Synaptic Vesicle
Cardiac Myocyte
Sarcoplasmic Reticulum
High calcium binds to
troponin to displace
tropomyosin from the myosin
binding sites on the actin
filaments
Myosin and actin bind
allowing the filaments to
slide closer together,
resulting in muscle
contraction
Actin Filament
Myosin Filament
The beta-1 adrenergic
receptor is coupled to and
activates the G-protein
signalling cascade.
The G-protein signalling
cascade activates protein
kinase which activates
calcium channels on the
membrane, resulting in
calcium influx.
High calcium activates the
ryanodine receptor on the
sarcoplasmic reticulum.
Cytosol
High cytosolic calcium leads
to muscle contraction
Once it reaches the heart,
it agonizes the beta-1
adrenergic receptor on the
cell membrane of myocytes.
T-tubule
Endogenous Dopamine inhibits
norepinephrine reuptake
Calcium
SLC6A2
TPM1
TPM2
ADRB1
CACNA1C
CACNA2D2
CACNB1
RYR2
PRKAR1A
SLC18A2
SLC6A3
CACNA1A
CACNA1B
SLC8A1
CACNA1H
CACNA1G
DBH
ATP2A2
PRKACA
Dopamine
Calcium
Norepinephrine
Norepinephrine
Calcium
Norepinephrine
Norepinephrine
Dopamine
Dopamine
Calcium
Calcium
Calcium
Sodium
Sodium
Calcium
Calcium
Calcium
Dopamine
Ascorbic acid
Oxygen
Dehydroascorbic
acid
Water
Adenosine
triphosphate
Water
Calcium
Adenosine
diphosphate
Phosphate
Calcium
Calcium
Troponin
Troponin
G-Protein
Signaling
Cascade
Muscle
Contraction