Podcast
Questions and Answers
True or false: The parathyroid gland is only located within the thyroid gland in pigs?
True or false: The parathyroid gland is only located within the thyroid gland in pigs?
True
True or false: The parathyroid gland consists of three main cells in most species?
True or false: The parathyroid gland consists of three main cells in most species?
False
True or false: The main secretory product of chief cells is a polypeptide containing 115 amino acids?
True or false: The main secretory product of chief cells is a polypeptide containing 115 amino acids?
False
True or false: Oxyphil cells contain granules called Oxyphil granules?
True or false: Oxyphil cells contain granules called Oxyphil granules?
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True or false: The function of oxyphil cells is well known?
True or false: The function of oxyphil cells is well known?
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Study Notes
Parathyroid Gland Location
- Located at or within the thyroid gland in humans, horses, and dogs
- In ruminants, the gland is located cranial to the thyroid gland (external parathyroid) and embedded in the thyroid gland (internal parathyroid)
- In pigs, there is only an external parathyroid gland
Parathyroid Gland Composition
- Consists of two main cell types in most species:
- Chief cells
- Oxyphil cells
Chief Cells
- Contain Golgi apparatus (GA) and endoplasmic reticulum (ER) with secretory granules
- Secrete parathyroid hormone (PTH)
- PTH is a linear polypeptide hormone containing 84 amino acids
- Synthesized as part of a larger molecule containing 115 amino acids (prepro-PTH)
- Upon entry to the ER, 25 amino acids are removed to form a 90-amino acid polypeptide (pro-PTH)
- 6 amino acids are removed from pro-PTH in the GA, resulting in the 84-amino acid PTH
Oxyphil Cells
- Function is unknown
- Contain granules called oxyphil granules
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Description
Test your knowledge about the parathyroid gland with this quiz. Explore its anatomy, location, and cellular composition in different animal species. Gain insights into the unique features of the parathyroid gland and enhance your understanding of this important endocrine organ.
