The Brain

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 kg (kilograms). It has a volume of about 3.21 litres and consists of about 12 billion (миллиард) cells. It was determined by the scientists that each cell is connected to the other directly or indirectly by nerve fibres.

The brain is the centre of a wide system of communication. It was 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 summarized and analysed the brain sends orders through the nerve fibres 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 that the investigators have been able to determine those areas of the brain which control vision, hearing, physical movements and even emotions.

Due to experimental studies it has been determined that the motor cortex controlling many body movements of the human being becomes tired rapidly. But the hypothalamus which controls such functions as blood pressure is almost never tired.

II. Работа над грамматикой. (30 мин)

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