The Nervous System
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The nervous system consists of a highly specialized network of cells called neurons that transmit electrochemical signals throughout the body; there are a hundred billion neurons in the brain alone. This section highlights the best places on the Web to learn about the human nervous system, from how the five senses work to technical aspects such as the mechanism by which action potential transmits sensory input to the brain.
- Most of these sites contain impressive graphics. If you’re searching the subject purely out of curiosity, visiting various sites to view the illustrations can give you a fascinating introduction to the topic.
- The nervous system’s billions of sensors’ responses to stimuli are all interpreted in the brain. To find out more about how the brain works, visit the findingDulcinea Science of the Brain Web Guide.
Whether you’re teaching a class about the systems of the body or simply looking to reassure your child before a tooth extraction, you’ll find all the information you’ll need on the Web sites recommended in this section.
- If you touch a hot stove and burn your hand, the pain isn’t actually in your hand—it’s in your head. The sites below explain why.
- To some extent, the nervous system controls every other system in the body. So if you’re teaching kids about all the systems of the body, it would be a good idea to save the nervous system for last, allowing you to explain how it interacts with the other systems they’re already familiar with.
Whether you’re a college biology student or medical student searching for information to help reinforce complex topics, a professor looking for supplemental lecture material or a researcher looking for PET scan images, you’ll find all this and more at the Web sites below.