Multiple Choice
Which structures are classified as primary lymphoid organs?
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20. The Lymphatic System
Primary Lymphoid Organs
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Which hormone is released by the thymus gland to support T-lymphocyte maturation?
A
Melatonin
B
Erythropoietin (EPO)
C
Thymosin
D
Insulin
Verified step by step guidance1
Step 1: Understand the role of the thymus gland in the immune system. The thymus is a primary lymphoid organ responsible for the maturation of T-lymphocytes (T-cells), which are critical for adaptive immunity.
Step 2: Identify the hormones or substances secreted by the thymus gland. The thymus produces thymic hormones that influence T-cell development and differentiation.
Step 3: Review the options given: Melatonin (produced by the pineal gland), Erythropoietin (EPO, produced by the kidneys to stimulate red blood cell production), Insulin (produced by the pancreas to regulate blood glucose), and Thymosin (produced by the thymus).
Step 4: Recognize that Thymosin is the hormone released by the thymus gland that supports the maturation and differentiation of T-lymphocytes.
Step 5: Conclude that among the options, Thymosin is the correct hormone associated with the thymus gland's role in T-cell maturation.
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