And Sense Organs

' With the aid of magnetic resonance imaging (MRI), doctors and scientists 1 can generate an image of neuron activity in the brain. The resulting image is color enhanced to show active areas, such as the yellow outer zone of cerebral cortex at the edges of the heavily convoluted cerebrum.

SECTION 1 Neurons and Nerve Impulses SECTION 2 Structure of the Nervous System SECTION 3 Sensory Systems SECTION 4 Drugs and the Nervous System

J, 3m merican For project ideas from

• ScientificAmerican, visit go.hrw.com and type in "" the keyword HM6SAM.

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