Endocrine System


Types of Hormones Based on Chemical Structure

Steroid hormones are derived from cholesterol. Cortisol and the reproductive hormones (androgens in males and estrogens in females) are examples of steroid hormones.

Chemical Class Water-or Lipid-soluble Examples
Eicosanoids Lipid soluble Prostaglandins, leukotrienes
Steroid hormones Lipid soluble Aldosterone, cortisol, androgens, calcitrol, testosterone, estrogens, progesterone
Thyroid hormones Lipid soluble T3 (triiodothyronine) and T4 (thyroxine)
Amines Water soluble Epinephrine and norepinephrine, melatonin, histamine
Peptides and proteins Water soluble All hypothalamic releasing and inhibiting hormones, oxytocin, antidiuretic hormone; human growth hormone, thyroid-stimulating hormone (TSH), follicle-stimulating hormone (FSH), luteinizing hormone, prolactin, melanocyte-stimulating hormone; insulin, glucagons, somatostatin, pancreatic polypeptide; parathyroid hormone, calcitonin, gastrin, secretin, cholecystokinin, glucose-dependent insulinotropic peptide, leptin


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