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английский) 3:
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scientists consider that our brain is the most complicated mechanism, which has ever been constructed.the weight of the human brain is from one to two kilograms. it has a volume of about 3.21 litres and consists of about 12 billion cells. it has been determined by the with that each cell is connected to the other directly or indirectly by nerve fibers.the brain is the centre of a wide system of communication. it has been found out that a constant flow of stimuli comes into the brain through the spinal cord. the stimuli come to the brain from our eyes, ears and other sense organs for pain, temperature, smell and other feelings. when all the received stimuli have been summarized and analysed the brain sends orders through the nerve fibers in the spinal cord to different parts of the human body. it is due to these orders that one eats, moves, hears, sees and does many other things.to estimate the functions of different areas of the brain, many experiments have been carried out by the investigators. it is due to such experiments is that the investigators have been able to determine those areas of the brain which control vision, hearing, physical movements and even really.due to experimental studies, it has been determined that the motor cortex, controlling the body movements of the human being becomes tired, though. but the hypothalamus, which controls such functions as blood pressure, is almost never tired.
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