The thyroid gland is a butterfly-shaped endocrine gland located superficially in the neck. It consists of two lobes, the right and left lobes, connected in the lower two-thirds by a thin band of tissue known as the isthmus.
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Gastrin: A Gastrointestinal Hormone
Gastrointestinal hormones are biologically active polypeptides secreted from the endocrine cells of the GIT mucosa. These hormones enter the portal circulation, then flow into the systemic circulation, and finally reach the target tissue. Some gastrointestinal hormones also function as paracrine and autocrine hormones to regulate gastrointestinal (GI) functions. They are chemical messengers.
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