A) Thyroid - Hyperactivity in young children causes cretinism.
B) Thymus - Starts undergoing atrophy after puberty.
C) Parathyroid - Secretes parathormone which promotes movement of sodium ions from blood into bones during calcification.
D) Pancreas - Delta cells of Islets of Langerhans secrete a hormone which stimulates glycolysis in liver.
Correct Answer: B
Solution :
[b] Thymus starts functioning in the embryonic stage itself, becomes active during childhood and undergoes regression and gradually stops functioning in old individuals. So, production of thymosin decreases. As a result, immune responses of old persons become weak.
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