The document discusses the thyroid and parathyroid glands and their hormones. It describes how the thyroid gland uses iodine to produce thyroid hormones which regulate metabolism. It also discusses hypothyroidism and hyperthyroidism, as well as parathyroid disorders. Nursing considerations are provided for patients taking thyroid hormones, antithyroid agents, antihypocalcemic agents, and antihypercalcemic agents.