Question

Thymosin hormone is secreted by
(A)Thyroid
(B)Thymus
(C)Parathyroid
(D)Hypothalamus

Answer 1

Hint: The name thymosin itself indicates which organ secretes it. It is secreted by the primary lymphoid organ of the immune system. This organ is also useful for the production of mature T-cells.

Complete step by step answer:
The Thymosin hormone is secreted by the Thymus gland. This thymosin hormone helps in or plays an important role in the differentiation of T-lymphocytes.
T lymphocytes or cells derived their name from the organ in which they get mature.
They are very important for the immune system of the body.
Thymosin is a type of hormone secreted from the thymus. Its primary function is to stimulate the production of T cells, which are a very important part of the immune system.
Thymosin also assists in the development of B cells to plasma cells to provide antibodies.
The predominant type of thymosin, thymosin b4, is found to be a member of a highly conserved family of actin monomer-sequestering proteins.The thymus is found within the upper front, a part of the chest, within the anterior superior mediastinum, behind the sternum, and ahead of the heart. It's made of two lobes, each consisting of a central medulla and an outer cortex, surrounded by a capsule.
In children, it was observed that the thymus is pinkish-gray in color and is soft, and lobulated on its surfaces.
At birth it's about 4–6 cm long, 2.5–5 cm wide, and about 1 cm thick. It increases in size until puberty, where it's going to have a size of about 40–50 g, following which it decreases in size during a process referred to as involution.
So, the correct answer is ‘Thymus '.

Note: Abnormalities of the thymus may result in an exceedingly decreased number of T cells and autoimmune diseases like Autoimmune polyendocrine syndrome type 1 and myasthenia. These are often related to cancer of the tissue of the thymus, called thymoma, or tissues arising from immature lymphocytes like T cells, called lymphoma.