The human circulatory system
Chapter 1
The engine of life
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Chapter 2
The vast red highway
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Chapter 3
The river of life
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Chapter 4
Pioneers of the pulse
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Chapter 5
Keeping the beat
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YOUR GOAL
Master of The human circulatory system
Ch 1 · The engine of life
Fun Fact
Heart power: A human heart generates enough physical energy daily to drive a truck for 20 miles.
Glossary
heart (noun)
A hollow muscular organ that pumps blood through the circulatory system by rhythmic contraction and dilation. In 1628, English physician William Harvey first described how this organ pumps blood throughout the human body.
A hollow muscular organ that pumps blood through the circulatory system by rhythmic contraction and dilation. In 1628, English physician William Harvey first described how this organ pumps blood throughout the human body.
Quiz
What is the name of the heart's natural pacemaker that generates electrical impulses?
Quiz
Approximately how many times does an average human heart beat during a typical 70-year lifetime?
Quiz
Which chamber of the human heart is responsible for pumping oxygen-rich blood to the rest of the body?
Quiz
Which organelle is found in unusually high amounts in cardiac muscle cells to prevent fatigue?