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Lymph glands, also known as lymph nodes, play a critical role in the body's immune system, functioning primarily as filters for foreign particles and pathogens. They are integral to the protection of the body against infections and diseases. As lymph fluid travels through these glands, they help to detect and respond to threats, producing immune cells such as lymphocytes that are vital for fighting off infections.

In contrast, respiration refers to the process of inhaling oxygen and exhaling carbon dioxide, which is not directly related to lymphatic function. Circulation involves the transportation of blood, nutrients, and waste products through the heart and blood vessels, while digestion pertains to the breakdown and absorption of food in the gastrointestinal tract. While these systems are important to overall health, the specific role of lymph glands is primarily associated with protection from disease and maintaining the immune response. Thus, the association of lymph glands with protection is what makes that answer the most appropriate one.