Book preface the human body is a series of interrelated systems circulatory and respiratory systems skeletal and muscular systems digestive and excretory systems endocrine and reproductive systems lymphatic and immune systems and the nervous system. Explore how the human brain grows from before birth to adulthood and how the earliest experiences in the first three years of life can dramatically shape and support brain development into adulthood the human brain begins forming very early in prenatal life just three weeks after conception but . The brain grows incredibly rapidly during these early years neurons get bigger work more efficiently and as a result of environmental input and stimuli make trillions of connections that fine tune everything from hearing to vision. Another brain part thats small but mighty is the brain stem the brain stem sits beneath the cerebrum and in front of the cerebellum it connects the rest of the brain to the spinal cord which runs down your neck and back. Many people think of the brain as a mystery they dont know much about intelligence and how it works when they do think about what intelligence is many people believe that a person is born either smart average or dumb and stays that way for life
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