Up Next in Body of Evidence

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  32:43

  Respiratory System (Lungs) 2

  Respiratory System (Lungs) 2

  Part 2: The human respiratory system—of which the lungs are the largest component—is the most high-tech air purification and conditioning system on earth.

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  37:17

  Digestive System 1

  Digestive System 1

  Part 1: The average person eats about 100,000 pounds of food during his lifetime. Have you ever considered what happens in the body to make use of all those grains, meats, and vegetables—plus all those fun sweets?

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  37:11

  Digestive System 2

  Digestive System 2

  Part 2: The average person eats about 100,000 pounds of food during his lifetime. Have you ever considered what happens in the body to make use of all those grains, meats, and vegetables—plus all those fun sweets?