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 4 · Hearts under pressure
Fun Fact
Space hearts: Astronauts on the International Space Station must exercise two hours daily to prevent their hearts from weakening in microgravity.
Glossary
hypertension (noun)
A chronic medical condition in which the blood pressure in the arteries is persistently elevated. In 1896, Scipione Riva-Rocci invented the mercury sphygmomanometer to help clinicians easily diagnose this condition.
A chronic medical condition in which the blood pressure in the arteries is persistently elevated. In 1896, Scipione Riva-Rocci invented the mercury sphygmomanometer to help clinicians easily diagnose this condition.
Quiz
Why does the human heart shrink slightly when living in a microgravity environment?
Quiz
Approximately how many days after conception does a human embryo's heart begin to beat?
Quiz
What hormone floods the body during extreme stress to cause Takotsubo cardiomyopathy?
Quiz
How much heart muscle mass can an astronaut lose during long-term spaceflight without exercise?
Quiz
How many liters of blood can an athlete's heart pump per minute during peak exercise?