Which change occurs in the immune and lymphatic systems due to aging?

• A. An increased risk of infection
• B. Improved immune response
• C. Decreased tissue dryness
• D. Enhanced lymphatic drainage

Answer: (A)

The immune and lymphatic systems undergo various changes as a person ages, leading to an increased risk of infection. This stems from a decrease in the production of new immune cells and a decline in the body's ability to respond effectively to pathogens. As individuals age, the thymus gland shrinks, which reduces the generation of T cells essential for the immune response. Moreover, the overall activity of B cells, which are responsible for antibody production, also diminishes. These factors contribute to a weakened immune response, making the elderly population more susceptible to infections and diseases.

In contrast, options related to improved immune response, decreased tissue dryness, and enhanced lymphatic drainage are not typically associated with aging. Instead, aging often leads to a reduced immune function and increased dryness in tissues, further highlighting why increased risk of infection is the most accurate choice regarding changes in the immune and lymphatic systems due to aging.