Endocrine System


How are hormones classified?

Scientists classify hormones broadly into two classes: those that are soluble in water (hydrophilic) and those that are not soluble in water (hydrophobic) but are soluble in lipids. The chemical structure of hormones determines whether they are water-soluble or lipid-soluble. Water-soluble hormones include amine, peptide, and protein hormones. The steroid hormones are lipid-soluble.

