What secretes thyroxine (t4) and thyrodothyronine (t3)? What is the most common cause of hyperthyroidism? What do you call the primary adrenocortical insuffiency?

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Pharmacology Exam 4 notes Chapter 44: Drugs for Pituitary, Thyroid, and Adrenal Disorders Negative Feedback: common for last hormone in a pathway to provide feedback - For example: o As serum calcium levels fall, PTH is released (PTH causes an increase in serum Ca) o Provides feedback to the parathyroid glands to shut off PTH secretion o Helps to prevent excessive secretion of hormones, limiting physiologic responses Hormone Pharmacotherapy - Hormones used as replacement therapy, antineoplastics, natural therapeutic effects - Hormone blockers used to inhibit actions of certain hormones Hypothalamus and Pituitary Glands - Control many other glands