Human Brain

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Human Anatomy

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Human Brain

The brain is the most complex part of the human body. This three-pound organ is the center of intelligence and controller of behavior. Lying in its bony shell and washed by protective fluid, the brain is the source of all the qualities that define our selves. The brain is the main sourse of the human body.


The largest part of the human brain is the cerebrum. The brain contains about 100 billion nerve cells (neurons). The brain is made up of about 75% water. There are no pain receptors in the brain, so the brain can feel no pain. There are 100,000 miles of blood vessels in the brain.

Your brain uses 20% of the total oxygen in your body. As with oxygen, your brain uses 20% of the blood circulating in your body. If your brain loses blood for 8 to 10 seconds, you will lose consciousness. It is thought that a yawn works to send more oxygen to the brain, therefore working to cool it down and wake it up.

The brain can live for 4 to 6 minutes without oxygen, and then it begins to die. No oxygen for 5 to 10 minutes will result in permanent brain damage. The next time you get a fever, keep in mind that the highest human body temperature ever recorded was 115.7 degrees–and the man survived. It goes to show that lack of sleep may actually hurt your ability to create new memories. Most people dream about 1-2 hours a night and have an average of 4-7 dreams each night.

Weight:The brain weighs about 3 pounds (1.4 kilograms). The brain makes up about 2 percent of a human's body weight for a 150 lb person. The cerebrum is the largest part of the brain and makes up 85% of the brain’s weight.

The Human Brain

If you are snoring, you are not dreaming. Laughing is no simple task, it requires activity in five different areas of the brain.


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