Explain human brain ,briefly.

1.	Explain human brain ,briefly.
Answer» The human brain is the central organ of the human nervous system, and with the spinal cord makes up the central nervous system. The brain consists of the cerebrum, the brainstem and the cerebellum. ... The cerebrum is the largest part of the human brain. It is divided into two cerebral hemispheres.Facts about the human brainThe human brain is the largest brain of all vertebrates relative to body sizeIt weighs about 3.3 lbs. (1.5 kilograms)The brain makes up about 2 percent of a human's body weightThe cerebrum makes up 85 percent of the brain's weightIt contains about 86 billion nerve cells (neurons) — the "gray matter"It contains billions of nerve fibers (axons and dendrites) — the "white matter"These neurons are connected by trillions of connections, or synapses

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