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Sodium/potassium-
transporting
ATPase subunit
gamma
ATPase,
(Na+)/K+
transporting,
beta 4
polypeptide
K
+
K
+
Ca
+
Sodium/potassium-
transporting
ATPase subunit
beta-3
Sodium channel
protein type 5
subunit alpha
Beta-2-
syntrophin
Beta-1-
syntrophin
Alpha-1-
syntrophin
Cytochrome P450
1A2
Cytochrome P450
3A4
Cytochrome P450
1A2
Cytochrome P450
3A4
Tropomyosin
alpha-1 chain
Tropomyosin
beta chain
Beta-1
adrenergic
receptor
cAMP-dependent
protein kinase
type I-alpha
regulatory
subunit
Voltage-
dependent
L-type calcium
channel subunit
alpha-1C
Voltage-
dependent
calcium channel
subunit
alpha-2/delta-2
Voltage-
dependent
L-type calcium
channel subunit
beta-1
Ryanodine
receptor 2
Muscarinic
acetylcholine
receptor M2
Cardiac
phospholamban
Sarcoplasmic/endoplasmic
reticulum
calcium ATPase
2
Sodium/potassium-
transporting
ATPase subunit
alpha-1
Sodium/potassium-
transporting
ATPase subunit
alpha-2
Sodium/potassium-
transporting
ATPase subunit
alpha-3
Sodium/potassium-
transporting
ATPase subunit
alpha-4
Sodium/potassium-
transporting
ATPase subunit
beta-2
Inward
rectifier
potassium
channel 4
Potassium
voltage-gated
channel
subfamily D
member 3
Kv channel-
interacting
protein 2
Potassium
voltage-gated
channel
subfamily A
member 5
Disks large
homolog 1
Potassium
voltage-gated
channel
subfamily KQT
member 1
Potassium
voltage-gated
channel
subfamily E
member 1
Potassium
voltage-gated
channel
subfamily E
member 2
ATP-binding
cassette
sub-family C
member 8
ATP-sensitive
inward
rectifier
potassium
channel 8
ATP-sensitive
inward
rectifier
potassium
channel 11
ATP-binding
cassette
sub-family C
member 9
Potassium
channel
subfamily K
member 1
Sodium/calcium
exchanger 1
Potassium/sodium
hyperpolarization-
activated
cyclic
nucleotide-
gated channel 4
Sodium channel
protein type 5
subunit alpha
Beta-2-
syntrophin
Beta-1-
syntrophin
Alpha-1-
syntrophin
Voltage-
dependent
T-type calcium
channel subunit
alpha-1H
Voltage-
dependent
T-type calcium
channel subunit
alpha-1G
Sodium/calcium
exchanger 1
cAMP-dependent
protein kinase
catalytic
subunit alpha
Sodium/potassium-
transporting
ATPase subunit
beta-1
Inward
rectifier
potassium
channel 2
Lidocaine
3-Hydroxylidocaine
3-
Hydroxymonoethylglycinexylidide
Monoethylglycinexylidide
2,6-Dimethylaniline
Glycinexylidide
2-Amino-3-methylbenzoate
4-Hydroxy-2,6-dimethylaniline
O
2
NADPH
H
+
H
2
O
NADP
O
2
NADH
H
2
O
Formaldehyde
NAD
Lidocaine
Heme
Heme
Heme
Heme
Ca
+
Na
+
Na
+
K
+
K
+
K
+
K
+
K
+
K
+
K
+
K
+
K
+
K
+
K
+
K
+
K
+
K
+
K
+
K
+
Ca
+
Ca
+
Na
+
Na
+
Na
+
Na
+
K
+
K
+
Na
+
Na
+
Ca
+
Ca
+
Ca
+
Ca
+
Ca
+
Na
+
Na
+
ATP
H
2
O
Ca
+
ADP
P
i
Ca
+
Ca
+
Troponin
Troponin
G-protein
signalling
cascade
G-protein
signalling
cascade
Muscle
Contraction
G protein-
activated
inward
rectifier
potassium
channel 1
G protein-
activated
inward
rectifier
potassium
channel 4
Potassium
voltage-gated
channel
subfamily H
member 2
Putative Dol-P-
Glc:Glc(2)Man(9)GlcNAc(2)-
PP-Dol
alpha-1,2-
glucosyltransferase
Cardiac Myocyte
Voltage-gated sodium channel
(INa)
Cardiac Muscle
Skeletal Muscle
Striated Muscle Cell
Nucleus
Mitochondrion
Myofibril
Sarcoplasmic Reticulum
Myofibril
Sarcolema
Sarcoplasmic Reticulum
Calcium binding to troponin
displaces tropomyosin from
the myosin binding sites on
the actin filaments
Myosin, with an ADP and
phosphate attached, binds to
actin to form a cross
bridge. Myosin performs a
powerstroke, drawing the
actin filaments together.
Many actin filaments pulled
together at the same time
leads to muscle contraction.
Actin Filament
Myosin Filament
T-Tubule
Depolarization
Mitochondrion
Single Sarcomere Functioning
Unit