Some common insulator<span> materials are glass, plastic, rubber, air, and wood. </span>Insulators<span> are used to protect us from the dangerous effects of electricity flowing through conductors. Sometimes the voltage in an electrical circuit can be quite high and dangerous.
Hope this helps :)</span>
I think it’s smooth muscle moves food through the digestive system
1.The presence of valves 2.the milking action of skeletal muscles 3. the veins as the muscles contract