Practice question

Endocrine disrupting chemicals represent diverse xenobiotics that interfere with endocrine system integrity by mimicking natural hormones, blocking receptor binding, altering hormone synthesis, transport or metabolism. They bind nuclear steroid receptors estrogen, androgen, thyroid, progesterone, modulating transcription of hormone-responsive genes governing sexual differentiation, brain organization and metabolism at low ecologically relevant concentrations. Compounds like BPA, DES, atrazine act via these pathways rather than directly on cell migration machinery or DNA replication. Their ability to act at nanomolar affinity explains widespread reproductive abnormalities and developmental anomalies observed after gestational exposure interfering with hormonal functions.