(05) Endocrine System - Parathyroid Gland

Question 1

(Parathyroid Gland)

1. A pair of parathryoid glands associated with (or not - varies with species) what?
2. Embryologic derivation is from what?
3. A capsule comprised of what surrounds each gland? In what animals is the conective tissue compnent thick?
4. Parenchyma is mainly small cells in what? These cells = what which secrete what?
5. Dark (basophilic cytoplasm) chief cells are metabollically active or inactive?
6. Light chief cells are what?

Answer 1

1. each of the two lobes of the thyroid gland (total of four parathyroid glands)
2. third and fourth pharyngeal pouch endoderm
3. thin connective tissue; pig and ox
4. clusters or cords; Chief (or principal cells) which secrete parathyroid hormone
5. active (and nuclei with condensed chromatin)
6. inactive or depleted of granules

Question 2

(Parathyroid Gland)

(Function)

1. What is the sole purpose of the parathyroid glands? in what range?
2. By doing this what else do parathyroid glands control concerning bones? therefore what?
3. As the blood filters through the parathyroid glands, they detect the amount of calcium present in the blood and react by making more or less what?

Answer 2

1. control calcium levels within blood; between 8.5 and 10.2
2. amount of calcium in bones; the strength and density of bones
3. parathyroid hormone (PTH)