| Hormone | Source | Function | |
| 1. | Melanin | Pineal gland | Regulates body clock |
| 2. | LH | Posterior pituitary | Growth and maintenance of corpus luteum |
| 3. | Erythropoietin | \(\alpha-\)cells of Langerhans | Promotes formation of RBCs |
| 4. | Somatostatin | Hypothalamus | Inhibits release of GH |
| 1. | Cretinism | - | Deaf mutism due to hyposecretion of thyroxine |
| 2. | Goitre | - | Enlargement of thyroid gland due to hyper-secretion of TSH |
| 3. | Diabetes inspidus | - | Diuresis due to hyposecretion of ADH |
| 4. | Growth hormone | - | Deficiency causes gigantism and acromagaly |