Students locate different types of nerve receptors in their skin.
Specialized cells perform specialized functions in multicellular organisms.
Nervous systems are formed from specialized cells that conduct signals rapidly through the long cell extensions that make up nerves. Above Standards from the National Science Education Standards . Use the sharp end of a pencil or bamboo skewer to gently poke the skin at any point within the one inch square boundary, being s ure not to break the skin. Direct students to take careful notice the sensation as they gently push the pointed end of the pencil on their skin. Move the point of the pencil one or two millimeters in any direction and push again.