QuestionSBA
QuestionChoice
This is not the correct answer. Parafollicular C cells & capillaries do not contain TSH receptors, and therefore would not respond to TSH.
10027335
e
Decreased number of parafollicular C cells and capillaries
QuestionChoice
This is the correct answer. Follicular cells are simple cuboidal cells which constitute the major cell type in the thyroid gland. These cells are responsible for the production and secretion of thyroid hormones triiodothyronine (T3) and thyroxine (T4). When the thyroid gland is stimulated by TSH, the follicular cells become active and thus, columnar-shaped.
10027331
a
Columnar-shaped follicular cells
QuestionChoice
This is not the correct answer. Thyroid follicles contain colloid, thyroglobulin, which is a acidophilic secretory glycoprotein. In the resting (inactive) stage, follicular cells are simple squamous cells with abundant collide within the lumen. When stimulated by TSH, I.e. active, the follicular cells are simple columnar with a scanty volume of colloid in the lumen. As such, there would not be an abundance of colloid in the follicular cells' lumen.
10027334
d
Abundance of colloid in follicular cells' lumen
QuestionChoice
This is not the correct answer. Parafollicular C cells are derived from the neural crest cells and secrete calcitonin, a polypeptide hormone. These cells do not contain TSH receptors, and therefore, are not stimulated by TSH.
10027333
c
Increased number of parafollicular C cells
QuestionChoice
This is not the correct answer. TSH stimulates follicular cells to release thyroid hormones, it does not result in a decreased number of follicular cells.
10027332
b
Decreased number of follicular cells
Concept
Chapter
2693
5970
Thyroid physiology
Topic
167
Endocrine physiology
17864
The histology of a thyroid gland being stimulated by thyroid stimulating hormone (TSH) would show which of the following features?
a