In the diagram of the thyroid gland, Which letter indicates the follicles with colloids?
A
B
C
D
E
The Correct Answer is A
Colloid is a gel-like substance found within the follicles of the thyroid gland. It plays a critical role in the synthesis and storage of thyroid hormones.
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Related Questions
Correct Answer is A
Explanation
a) Lumen of follicle: Iodide is actively transported into follicular cells, then secreted into the follicular lumen, where it becomes oxidized and incorporated into thyroglobulin during the synthesis of thyroid hormones (T3 and T4).
b) Secretory vesicles inside follicular cells: These vesicles may contain thyroglobulin, but iodide is concentrated in the lumen for hormone synthesis.
c) Golgi apparatus of parafollicular cells: Parafollicular (C) cells produce calcitonin, not thyroid hormones.
d) Cytoplasm of follicular cells: While iodide is transported into the cytoplasm briefly, its major functional location is in the lumen.
Correct Answer is A
Explanation
a) Ferritin: Ferritin is a protein complex that stores iron in the liver, releasing it when needed.
b) Transferrin: Transferrin is the transport protein that carries iron in the blood, not a storage form.
c) Hemosiderosis: This is a pathological condition caused by excess iron deposition in tissues, not a normal storage mechanism.
d) Ferrin: “Ferrin” is not a physiologically recognized iron storage molecule.
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