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 3 · The river of life
teacher Sixty thousand miles of crimson roads (so long!) / Wrapping twice around the Earth, here we go! (here we go!)
Fun Fact
Iron in blood: Your blood contains enough iron to forge a small metal nail, which is why blood tastes metallic.
Glossary
blood (noun)
The red fluid that circulates in the vascular system of humans, delivering oxygen and nutrients. The average adult body contains about five liters of this fluid, which travels through miles of vessels.
The red fluid that circulates in the vascular system of humans, delivering oxygen and nutrients. The average adult body contains about five liters of this fluid, which travels through miles of vessels.
Quiz
What percentage of human blood volume is made up of the liquid portion called plasma?
Quiz
What unique structural feature do mature human red blood cells lack to make more room for oxygen?
Quiz
What iron-rich protein inside red blood cells binds to oxygen and gives blood its red color?
Quiz
How long does a typical red blood cell circulate in the human body before being recycled?
Quiz
Unlike red blood cells, what can white blood cells do to reach infections in surrounding tissues?
Quiz
Which blood component is actually a tiny cell fragment responsible for forming blood clots?