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Edexcel GCE

Biology
Advanced Unit 5: Energy, Exercise and Coordination
June 2010 Scientific Article for use with Question 7
Do not return the Insert with the question paper.
Paper Reference

6BI05/01

Turn over

N37096A
©2010 Edexcel Limited.

1/1/1/1/1/

*N37096A*

Scientific Article for use with Question 7 It’s All in the Mind The link between the brain as a physical organ and what we feel in our conscious mind has long been the subject of research, particularly where we appear to be unable to control aspects of mood or behaviour and where normal life is affected. Stress, pain and depression can be explained in terms of nerve impulses and brain chemistry, and the causes of Parkinson’s disease are well understood, but finding reliable ways of correcting problems has proved elusive. Understanding more about how the brain works may well lead to new methods for treating such problems. Dancing Worms and Deep Depression In a laboratory in Germany, a tiny worm dances to flashes of light. A flash of yellow and it darts forward. A flash of blue and it jerks back. Yellow, forward, blue, back – right on cue every time. The worm is not a toy or a robot but a living creature. It has been engineered so that its nerves and muscles can be controlled with light. With each flash of blue its neurons fire electric pulses, causing the muscles they control to clench. A flash of yellow stops the nerves firing, relaxing the worm’s muscles and lengthening its body once again. The worm is in the vanguard of a revolution in brain science – the most spectacular application yet of a technology that allows scientists to turn individual brain cells on and off at will. “It’s really changing the whole field of neuroscience,” says the worm’s developer, neurobiologist Alexander Gottschalk at the University of Frankfurt. One possibility is that the technology, coupled with a method of getting light

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