How the heart works
Chapter 1
The four-chambered engine
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Chapter 2
The spark of life
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Chapter 3
Mapping the flow
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Chapter 4
Hearts under pressure
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YOUR GOAL
Master of How the heart works
Ch 2 · The spark of life
Fun Fact
Heart electricity: The electrical energy generated by the human heart is strong enough to be measured from several feet away with sensitive detectors.
Glossary
pacemaker (noun)
A specialized area of heart muscle, or an implanted electronic device, that regulates the heartbeat. In 1958, Swedish inventor Rune Elmqvist designed the first implantable model to regulate irregular heartbeats.
A specialized area of heart muscle, or an implanted electronic device, that regulates the heartbeat. In 1958, Swedish inventor Rune Elmqvist designed the first implantable model to regulate irregular heartbeats.
Quiz
What is the term for the heart's ability to generate its own electrical impulses independently?
Quiz
How do electrical signals travel from the AV node down to the bottom of the ventricles?
Quiz
What mineral is most critical for carrying the electrical charge across cardiac cell membranes?
Quiz
Why does the atrioventricular (AV) node briefly delay the electrical signal in the heart?
Quiz
Who invented the first practical electrocardiogram (ECG) to measure heart electricity in 1901?