Bigger animals, such as elephants and whales, have larger brains, but when they are measured via encephalization coefficient (which compensates the body size), the human brain coefficient is practically twice as large as the common dolphin coefficient and three times bigger than the chimpanzee coefficient. It is a distributed set of billions of cells. The brain splits in left and right hemispheres. It embodies 2% of body mass, but it takes approximately 25% of all the blood pumped by the heart. The human brain is particularly complex and extensive. Human brain has the same overall construction and anatomy as other mammalian brains, but it has a more developed cerebral cortex. The human brain is the main Central Nervous System organ, situated in the head, protected by the cranium.
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