The human circulatory system
The engine of life
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The vast red highway
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The river of life
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Pioneers of the pulse
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Keeping the beat
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YOUR GOAL
Master of The human circulatory system
teacher A highway of rivers that run deep inside, Wrapping twice 'round the Earth on a beautiful ride.
Whale hearts: A blue whale's heart is so large that a human child could easily crawl through its main artery, the aorta.
A specialized group of cells or an electronic device that regulates the rhythm of the heartbeat. In 1958, Swedish surgeon Åke Senning implanted the first clinical device to regulate a patient's heart.
What is the typical resting heart rate range for a healthy, non-athlete adult human?
How many times per minute does the massive heart of a blue whale beat when it dives?
What is the physiological response that slows down the human heart rate when the face is submerged in cold water?
What physical change happens to an astronaut's heart shape while living in microgravity?
Why can an elite athlete's resting heart rate safely drop below 40 beats per minute?