The thyroid and parathyroid glands

Le résumé fourni par la source

This chapter focuses on the principal hormones secreted by the thyroid and the parathyroid glands. It looks at the thyroid gland which secretes two iodine-containing hormones, thyroxine (T4) and tri-iodothyronine (T3). These exert a wide variety of actions throughout the body. These glands are chiefly concerned with the regulation of metabolism and the promotion of normal growth and development. The chapter refers to a third hormone known as calcitonin, which is secreted by cells scattered throughout the gland and is considered a peptide hormone that plays a role in the regulation of plasma calcium levels. Lying embedded within the thyroid gland are several small glands known as the parathyroid glands that secrete a polypeptide hormone called parathyroid hormone (PTH).

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