Enteroendocrine cells of the intestine are the most numerous endocrine cells of the body. In a sense they are known to act as chemoreceptors, initiating digestive actions and detecting harmful substances and initiating protective responses.
The typical manufacturer's warranty on a solar panel is 25 to 30 years, but panels can last up to 40 years with care and attention.
Solar panels are also considered the life blood of a solar power system, because solar panels actually capture the sun's radiation, thereby initiating the entire process of converting sunlight into an electrical current. The job of solar panels is to essentially create the electrical current.