Peptide hormone growth hormone, which acts on bone, muscle, and the liver. The posterior pituitary gland secretes antidiuretic hormone, also called vasopressin, and oxytocin. The parathyroid gland secretes parathyroid hormone, the main hormone responsible for regulating serum calcium and phosphorus levels. Peptide hormones are also produced by many different organs and tissues, including the heart (atrial-natriuretic peptide (ANP) or atrial natriuretic factor (ANF)) and pancreas (glucagon, insulin and somatostatin), the gastrointestinal tract (cholecystokinin, gastrin), and adipose tissue stores (leptin). Peptide hormone Peptide hormones or protein hormones are hormones whose molecules are peptides or proteins, respectively. The latter have longer amino acid chain
Adrenocortical hormone the pituitary gland or adrenal gland. In either case, treatment may rely on removal of the tumor or of the adrenal glands. Without the adrenal glands, the human body is unable to supply the hormones it produces and therefore requires hormone replacement therapy. Addison’s disease is an autoimmune disorder that affects the adrenal cortex such that it is unable to efficiently secrete hormones. The immune system specifically targets the cells of the adrenal cortex and destroys them, but Addison’s disease can also be caused by a severe infection such as tuberculosis. Some symptoms include hypoglycemia and decreased blood sodium levels