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The excretory system, also known as the urinary system, plays a crucial role in the body by facilitating the elimination of waste products. This system includes several key organs: the kidneys filter the blood to remove waste and excess substances, producing urine. The liver processes toxins and helps in the formation of urea, which is then excreted. The skin also contributes to waste elimination through perspiration, releasing salts and other metabolic waste. The large intestine is important for eliminating solid waste and regulating water absorption, while the lungs expel carbon dioxide, a byproduct of metabolism, from the body.

Together, these organs ensure that harmful substances are expelled, maintaining the body's internal balance and health. Overall, the excretory system is essential for detoxification and maintaining homeostasis. Other systems listed have different primary functions and do not focus primarily on waste elimination. For instance, the digestive system is concerned with food processing and nutrient absorption, the circulatory system is involved in transporting blood and nutrients around the body, and the endocrine system focuses on hormone regulation. Thus, the classification of these organs as part of the excretory system underscores their collective role in waste management.