Biology - Chemical Coordination and Integration Question with Solution | TestHub
In the following diagram, what does A, B, C and D indicate?
Options:
Answer:
Solution:
Based on the histological structure shown in the diagram, it represents the transverse section of a thyroid gland.
The labels correspond to the following structures:
A indicates a Follicle, which is the structural and functional unit of the thyroid gland.
B indicates Parafollicular cells (also known as C cells), which are located in the interstitial spaces between the thyroid follicles and secrete calcitonin.
C indicates Follicular cells, which are the cuboidal epithelial cells lining the follicle that synthesize and secrete thyroid hormones (T3 and T4).
D indicates the Colloid, which is the gelatinous substance filling the lumen of the follicles, primarily composed of thyroglobulin.
Answer: A - Follicle, B - Parafollicular cells, C - Follicular cells, D - Colloid
