46. The Heart
is a pump
has electrical activity
(action potentials)
generates electrical
current that can be measured
on the skin surface (the EKG)
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48. Conduction in the Heart
0.12-0.2 s approx. 0.44 s
SA
Atria
Atrial muscle
SA node Left atrium
Descending aorta
Inferior
vena cava
Ventricluar
Pulmonary
veins
Superior
vena cava
Tricuspid valve
Mitral valve
AV node
Purkinje
fibers
muscle
Specialized
conducting
tissue
Purkinje
Ventricle
node
node
AV
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49. The Normal EKG
P
Q
R
S
T
Right Arm
Left Leg
QT
PR
0.12-0.2 s approx. 0.44 s
Atrial muscle
depolarization
Ventricular muscle
depolarization
Ventricular
muscle
repolarization
“Lead II”
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50. Action Potentials in the Heart
AV
Purkinje
Ventricle
Aortic artery
Left atrium
Descending aorta
Inferior
vena cava
Ventricluar
Atrial muscle
Pulmonary
veins
Superior
vena cava
Pulmonary artery
Tricuspid valve
Mitral valve
Interventricular
septum
AV node
SA node
ECG
QT
PR
0.12-0.2 s approx. 0.44 s
SA
Atria
Purkinje
fibers
muscle
Specialized
conducting
tissue
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51. Start of EKG Cycle
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