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The Human Body

Brain Basics
The brain is one of the largest and most important organs of the human body. Weighing in at about three pounds, this organ has a wide range of responsibilities.

Brain Produces Drug Similar to Marijuana
The brain produces a substance similar to the active ingredient in marijuana in response to pain.

Gotta Breathe, Gotta Breathe
No, I'm not referring to breathing with your lungs but to cellular respiration.

Journey into the Cell
The first in a multi-part series about the structure of the fundamental unit of life -- the cell.

The first in a multi-part series about the process of cell division.

Immune System
Imagine trying to defend a fortress that is constantly under attack from outside invaders. Now you have an idea of the immense task that our natural defense system must undergo to keep us healthy.

Organ Systems
Can you identify the organ system which contains the pituitary, pineal, and thyroid glands?

Regeneration of Brain Cells
For almost one hundred years scientists believed that brain cells don't regenerate--until now.

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