1. Hormones
   1. Water-soluble hormones
      1. Amine hormones
      2. Peptide hormones
      3. Protein hormones
   2. Lipid-soluble hormones
      1. Steroid hormone
2. The Human Endocrine System
   1. Endocrine cells
      1. Target cells
   2. Glands
      1. Brain
         1. Hypothalamus
         2. Pituitary gland
            1. Posterior pituitary
            2. Anterior pituitary
            3. FSH
            4. LH
            5. GH
            6. Endorphins
      2. Thyroid
         1. Calcitonin
         2. Hyperthyroidism
         3. Hypothyroidism
      3. Parathyroid
         1. Parathyroid hormone
      4. Pancreas
         1. Insulin
         2. Glucagon
         3. Diabetes mellitus
            1. Insulin-dependent diabetes
            2. Non-insulin-dependent diabetes
            3. Gestational diabetes
      5. Adrenal Glands
         1. Adrenal medulla
            1. Epinephrine
            2. Norepinephrine
         2. Adrenal cortex
            1. Adrenocorticotropic hormone
            2. Glucocorticoids
      6. Gonads
         1. Estrogens
         2. Progestins
         3. Androgens