The parathyroid glands are located on the posterior surface of the thyroid.
1. Structure of the glands a. Each gland is small and yellow-brown, within a thin connective tissue capsule.
b. Each gland consists of secretory cells that are well supplied with capillaries.
2. Parathyroid hormone (PTH)
a. PTH increases blood calcium ion concentration and decreases blood phosphate ion concentration.
b. PTH stimulates resorption of bone tissue, causes the kidneys to conserve calcium ions and excrete phosphate ions, and indirectly stimulates absorption of calcium ions from the intestine.
c. A negative feedback mechanism operating between the parathyroid glands and the blood regulates these glands.
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This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.