How Does The Brain Work – Science

(Host: Neil Degrasse Tyson)
– The human brain is the command center for the human nervous system. It receives input from the sensory organs and sends output to the muscles. The human brain has the same basic structure as other mammal brains, but is larger in relation to body size than any other brains.
– The human brain is the largest brain of all vertebrates relative to body size
– It weighs about 3.3 lbs. (1.5 kilograms)
– The brain makes up about 2 percent of a human’s body weight
– The cerebrum makes up 85 percent of the brain’s weight
– It contains about 86 billion nerve cells (neurons) — the “gray matter”
– It contains billions of nerve fibers (axons and dendrites) — the “white matter”

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