What Is the Brain

As an adult, the human brain weighs about three and a half pounds and is protected by the skull. The brain is designed to interpret sensory input and decipher other incoming information, to develop both short- and long-term memory, to originate and coordinate most muscular movement, and to regulate the function of many of our organs. With all that it does, it is easy to conclude that our brain is densely packed with neurons. And, with so many neuron operations taking place within the brain, the electrical activity can be measured by placing sensors on the skin of the head. The recorded output of this measurement is called an electroencephalogram or simply EEG.

No other animal on this planet has such a developed brain relative to its body size. In fact, the human brain is so big that during pregnancy the size of the baby's head is a primary factor dictating the timing of birth. If babies were not born until the 10th or 11th month of pregnancy, it would be extremely difficult for the head to fit through the mother's birth canal.

Pregnancy And Childbirth

Pregnancy And Childbirth

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