Which option represents a listed animal body system that deals with lymphoid tissues and immune function?

• A. Nervous system
• B. Lympho-reticular system
• C. Digestive system
• D. Excretory system

Answer: (B)

The main idea is identifying the system that specifically handles lymphoid tissues and immune function. The lympho-reticular system encompasses lymphoid organs such as lymph nodes, spleen, and thymus, along with reticuloendothelial (phagocytic) cells. These components work together to produce and mature lymphocytes, filter lymph, present antigens, and coordinate immune responses. Other systems don’t focus on immune tissues: the nervous system governs signaling and control, the digestive system handles nutrient processing, and the excretory system deals with waste elimination. So the lympho-reticular system is the right fit for lymphoid tissues and immune function.