What is the Endocrine System? You may remember learning in biology class that our bodies are run by a network of hormones and glands that regulate everything we do. This endocrine system is most often thought about in the context of puberty, but it actually plays a starring role in all phases of development, metabolism, and behavior. Endocrine disruptors like BPA and phthalates lurk in everything from cleaning products to fragrances. Endocrine-disrupting chemicals (EDCs) are