The 'Hormone Thymosin' is secreted by the thymus gland and plays a crucial role in the immune system by:
A. Suppressing the immune response
B. Producing antibodies
C. Promoting the differentiation and maturation of T-lymphocytes
D. Killing pathogens directly
Answer: Option C
Solution (By JKSSB Mock Tests)
Thymosin is a group of peptide hormones secreted by the epithelial cells of the thymus gland. The thymus is the primary site for the maturation of T-lymphocytes (T cells), which are essential for cell-mediated immunity. Thymosin plays a critical role in this process by promoting the differentiation, development, and maturation of immature T cells (thymocytes) into functional, immunocompetent T cells. As the thymus involutes (shrinks) after puberty, thymosin levels decline.
Explanation:
Hemophilia A and B are X-linked recessive disorders caused by mutations in genes for clotting factor VIII or IX on the X chromosome. It predominantly affects males, while females are usually carriers. Down syndrome is an autosomal aneuploidy, cystic fibrosis and sickle cell anemia are autosomal recessive. X-linked disorders follow a characteristic pattern of inheritance.
Consider the following statements about the human kidney:
1. It filters blood and forms urine.
2. It reabsorbs glucose in the collecting duct.
3. It secretes erythropoietin.
Which of the above is/are correct?
Explanation:
Kidneys filter blood (1) and produce erythropoietin (3). Glucose reabsorption occurs in the proximal tubule, not collecting duct. So 2 is incorrect.
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