Most pituitary hormones, however, travel to endocrine end-organs and tell them to secrete their own hormones (thyroid stimulating hormone, for example, travels to the thyroid gland and tells it to secrete thyroid hormone). A few of these hormones travel to distant tissues to give instructions (prolactin, for example, travels to the breast and stimulates milk production). The main controlling hub of the system is the pituitary gland, a pea-sized gland at the base of the brain that secretes a bunch of hormones. In this post, we’ll take a big-picture look at how the classical endocrine system works. There are a bunch of other organs that are not primarily endocrine organs – the gut, for example – that secrete hormones too. The classical endocrine system includes the pituitary, thyroid, parathyroids, adrenals and pancreas. The endocrine system is a collection of organs that secrete hormones (substances that travel through the body to distant places, where they tell cells what to do).
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