APK 2105C Lecture Notes - Lecture 45: Thyrotropin-Releasing Hormone, Anterior Pituitary, Parathyroid Gland

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Chapter 6, Lecture 1
Endocrine Glands & Hormones
Primary vs. secondary endocrine organs
o Primary = primary function is secreting hormone
Pineal gland
Hypothalamus
Pituitary gland
Thyroid gland
Parathyroid gland
Thymus
Adrenal gland
Pancreas
Ovaries
Testes
Placenta
o Secondary = can secrete hormones but is not primary function (ex: heart)
Heart
Stomach
Liver
Kidney
Small intestine
Skin
Hypothalamus and pituitary gland
o Collectively function to regulate nearly every system
o Hypothalamus stimulates the anterior pituitary gland
Hypothalamic tropic hormones are neurohormones
Either activate or inhibit release of tropic hormones from anterior
pituitary gland
o Ex: dopamine prevents endocrine cells from releasing
prolactin from anterior pituitary
Prolactin helps with milk let down
Have multiple neurons that release many different hormones
o PRH
o PIH
o TRH
o CRH
o GHRH
o Pituitary gland hangs off end of hypothalamus
Stalk that it hands off = infindibulum
2 lobes
Anterior (adenohypophysis)
o Glandular tissue
In-series blood flow between the hypothalamus and
anterior pituitary gland
Hypothalamic portal veinleads to a 2nd
capillary bed
Has gland cellsderived from epithelium
Neurons from hypothalamus release hormones that
go into capillary bed
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