Nursing Entrance Exam (NEX) Practice Exam

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Which organ system does NOT assist in excretion?

Respiratory
Lymphatic
Digestive
Urinary

The correct answer is: Lymphatic

The lymphatic system primarily functions in fluid balance, fat absorption, and immune responses but does not play a direct role in excretion. Excretion involves the removal of waste products from the body, and while the lymphatic system helps in the transport of waste products from tissues, it is not considered an organ system dedicated to excreting waste as the others are. In contrast, the respiratory system expels carbon dioxide, a metabolic waste product, through breathing. The digestive system aids in the excretion of solid waste through the elimination of undigested food and other waste products. The urinary system is specifically designed for excretion, filtering blood to remove excess substances and waste, creating urine for elimination. Thus, the lymphatic system does not assist in excreting wastes from the body like the respiratory, digestive, and urinary systems do. Understanding the distinct functions of each organ system clarifies why the lymphatic system is not categorized as an excretory system.