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Question
The modern idea about ageing is that our body slowly loses the power of defence against the invasion of germs and pathogens. This gradual loss/decrease in the immunity can be attributed to which organ?
The modern idea about ageing is that our body slowly loses the power of defence against the invasion of germs and pathogens. This gradual loss/decrease in the immunity can be attributed to which organ?
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Solution
The correct option is B Thymus gland
The thymus grows rapidly and attains its greatest size relative to the rest of the body during foetal life and the first years after birth. Thereafter, it continues to grow, but more slowly than the other organs. The thymus is responsible for the maturation of the T-lymphocytes which the most critical cells for maintaining the immunity of the body. At the onset of puberty, the thymus begins a slow process of shrinking. This gradual diminution in size continues for the rest of the individual's life. During the involution or shrinking of the thymus, the cortex becomes thin. Lymphocytes disappear and are replaced by fat tissue from the partitions between the lobules. Thus, the loss of lymphocytes will result in decreased immune power. Thus, the correct option is B.
The thymus grows rapidly and attains its greatest size relative to the rest of the body during foetal life and the first years after birth. Thereafter, it continues to grow, but more slowly than the other organs. The thymus is responsible for the maturation of the T-lymphocytes which the most critical cells for maintaining the immunity of the body. At the onset of puberty, the thymus begins a slow process of shrinking. This gradual diminution in size continues for the rest of the individual's life. During the involution or shrinking of the thymus, the cortex becomes thin. Lymphocytes disappear and are replaced by fat tissue from the partitions between the lobules. Thus, the loss of lymphocytes will result in decreased immune power. Thus, the correct option is B.
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