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Gq protein
signaling
cascade
Phospholipase C
Inositol 1,4,5-
trisphosphate
receptor type 1
Protein kinase
C alpha type
Voltage-
dependent
P/Q-type
calcium channel
subunit
alpha-1A
Voltage-
dependent
L-type calcium
channel subunit
beta-1
Voltage-
dependent
calcium channel
subunit
alpha-2/delta-2
Myosin light
chain kinase,
smooth muscle
Muscarinic
acetylcholine
receptor M3
Acetylcholinesterase
Myosin LC-P
Myosin light
chain 3
Vesicular
acetylcholine
transporter
Calmodulin-1
Myosin light
chain
phosphatase
Choline O-
acetyltransferase
Calmodulin-1
Inositol 1,4,5-trisphosphate
Atropine
Acetylcholine
Ca
+
Ca
+
Ca
+
Acetylcholine
Acetylcholine
Atropine
Phosphatidylinositol
4,5-bisphosphate
Choline
Acetylcholine
H
2
O
Acetic acid
Choline
Calcium
Ca
+
Diacylglycerol
Organophosphate
Muscle
Contraction
Muscle
Relaxation
Magnesium
Calcium
Manganese
Magnesium
Sarcoplasmic Reticulum
Myosin unbinds from actin
causing muscle relaxation
Decreased calcium is unable
to bind readily to
calmodulin so it does not
activate myosin light chain
kinase
Organophosphates and other
muscarinic poisons
continuously activate muscle
contractions. Atropine
prevents this, which
prevents muscles from
seizing.
There is an overall decrease
in calcium levels in the
cytosol caused by the
inhibition of the Gq
signaling cascade
Cytosol
Muscle Cell
Atropine antagonizes
Muscarinic acetylcholine
receptors M1-M5 in order to
counteract the high
concentration of
acetylcholine causes by
muscarinic poisons.
The inhibition of Myosin
light chain kinase prevents
muscle contraction, leading
to muscle relaxation.
Organophosphate inhibits
acetylcholinesterase which
prevents the breakdown of
acetylcholine. This leads to
a high concentration of
acetylcholine which
continuously activates
muscarinic acetylcholine
receptors, causing muscle
contractions.
Cytosol
Presynaptic Neuron
Synaptic vesicle
Breakdown of acetylcholine
can occur in the neuron, or
in the extracellular space
around neurons and muscles.
Actin
Myosin
Atropine is administered as
an intravenous injection
Vacuole
GNAQ
PLCB1
ITPR1
PRKCA
CACNA1A
CACNB1
CACNA2D2
MYLK
CHRM3
ACHE
MYL3
MYL3
SLC18A3
CALM1
PPP1CB
CHAT
CALM1
Inositol 1,4,5-
trisphosphate
Atropine
Acetylcholine
Calcium
Calcium
Calcium
Acetylcholine
Acetylcholine
Atropine
Phosphatidylinositol
4,5-
bisphosphate
Choline
Acetylcholine
Water
Acetic acid
Choline
Calcium
Diacylglycerol
Organophosphate
Muscle
Contraction
Muscle
Relaxation