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Human: The World Within

Functions of the Heart and Lungs

At the center of the circulatory system is the heart, which works with the lungs to constantly keep the body supplied with freshly oxygenated blood. Every time we breathe in, we are infusing blood flowing through tiny vessels in the lungs with oxygen that can be carried to the furthest reaches of our anatomy.

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Full Episodes
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Episode
52:30
Human: The World Within

React

See how the technology of the brain and nervous system shape our experience of the world.
Season 1 Episode 6
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Episode
52:33
Human: The World Within

Sense

Explore the incredible world of human sensation and how it defines our reality.
Season 1 Episode 5
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Episode
52:33
Human: The World Within

Defend

Uncover how the human body defends itself in an increasingly dangerous global environment.
Season 1 Episode 4
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Episode
52:33
Human: The World Within

Fuel

Journey through the factory at the center of our bodies that turns food into energy.
Season 1 Episode 3
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Episode
52:30
Human: The World Within

Pulse

See the world beneath the human heartbeat that makes our craziest feats possible.
Season 1 Episode 2
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Episode
52:30
Human: The World Within

Birth

Learn the story of human reproduction from attraction to a baby’s first breath.
Season 1 Episode 1
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