Unit 21 Human Biology Lesson 2 Brain Power
Exercise 2 Listen to a science lesson. Use the strategies to complete the gaps in this summary. Right, the topic of today's lesson is "the brain". Well... it is an absolutely amazing organ.The brain consists of grey and white matter. It weighs just over a kilo just imagine that, like a kilo of potatoes. But this is a very special kilo. It uses twenty percent of the body's energy. And it contains over one hundred billion cells that's a "billion" with a "b". One hundred billion cells.These make up nerve cells, which are connected by electrical impulses. The brain sends messages using electrical impulses, the same way as a computer works. But there are more possible connections in one brain than there are more atoms in the universe. Just think about that again. There are more possible connections in one brain than there are more atoms in the universe.
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