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The modern idea about ageing is that our...

The modern idea about ageing is that our body slowly loses the power of defence against the invasion of germs and pathogens. This proces starts by the disappearance of which organ?

A

spleen

B

thymus gland

C

pituitary gland

D

parathroid gland

Text Solution

AI Generated Solution

The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding the Question**: The question states that the modern idea about aging involves the body's gradual loss of defense against germs and pathogens. We need to identify which organ's disappearance initiates this process. 2. **Identifying Relevant Organs**: The options provided are the spleen, thymus, pituitary gland, and parathyroid gland. We need to consider the role of each organ in the immune system. 3. **Function of the Thymus Gland**: The thymus gland is crucial for the development and differentiation of T-lymphocytes (T-cells), which are essential for the immune response. It produces thymosin, a hormone that plays a significant role in the immune system. 4. **Aging and the Thymus Gland**: As individuals age, the thymus gland undergoes atrophy (degeneration). This leads to a decrease in the production of thymosin, resulting in a weakened immune response. 5. **Conclusion**: Given that the thymus gland is primarily responsible for the immune system's functionality and its degeneration is linked to the aging process, the organ that disappears and starts the decline in immune defense is the thymus gland. **Final Answer**: The organ whose disappearance starts the process of aging related to immune defense is the **thymus gland**. ---
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