BIO 12D Lecture Notes - Lecture 29: Blood Proteins, Anterior Pituitary, Thyroglobulin
3 Dec 2020
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Document Summary
Manufactured by nerve cells whose cell bodies lie in the hypothalamus. The hormones are carried down to the terminal end of the nerve and are released in response to action potentials. They are the antidiuretic hormone (adh/vasopressin) and oxytocin. Several hormones are at work at any one time. The hypothalamus secretes a releasing hormone h1 that causes the release of an anterior pituitary hormone h2 into the blood. H2 decreases the release of h1 in a short loop negative feedback system to the hypothalamus. H2 circulates to an endocrine gland to cause the release of h3. H3 feeds back to the hypothalamus and pituitary to decrease the release of h1/h2 in a long loop negative feedback system. In some cases, h3 will affect one or more target tissues, which can feed back to the hypothalamus and decrease the release of its hormone h1 in an ultra long loop reflex.
