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Inside Human Mouth

Photo: Inside human mouth
Inside the mouth, shown magnified here, teeth, tongue, and saliva work together to physically and chemically break down food. Humans produce up to 3 pints (1.4 liters) of saliva daily, and chemical enzymes in the saliva play a major role in disintegrating starchy foods.
Photograph by Lennart Nilsson

Health and Human Body Topics

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Adventure Videos

Check out adventure videos from our West Coast Adventure Editor Steve Casimiro and go "Behind the Lens."

Body: The Complete Human

Image: Cover of Body: The Complete Human book

Explore the human machine.

The Incredible Human Body DVD and Video

Image: Cover of the Incredible Human Body video and DVD

Explore the human body from the inside out.