The human circulatory system
Chapter 1
The engine of life
View / Create
Answer
Chapter 2
The vast red highway
View / Create
Answer
Chapter 3
The river of life
View / Create
Answer
Chapter 4
Pioneers of the pulse
View / Create
Answer
Chapter 5
Keeping the beat
View / Create
Answer
YOUR GOAL
Master of The human circulatory system
Ch 5 · Keeping the beat
teacher A highway of rivers that run deep inside, Wrapping twice 'round the Earth on a beautiful ride.
Fun Fact
Whale hearts: A blue whale's heart is so large that a human child could easily crawl through its main artery, the aorta.
Glossary
pacemaker (noun)
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.
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.
Quiz
What is the typical resting heart rate range for a healthy, non-athlete adult human?
Quiz
How many times per minute does the massive heart of a blue whale beat when it dives?
Quiz
What is the physiological response that slows down the human heart rate when the face is submerged in cold water?
Quiz
What physical change happens to an astronaut's heart shape while living in microgravity?
Quiz
Why can an elite athlete's resting heart rate safely drop below 40 beats per minute?