Which body system includes major organs such as kidneys, ureters, bladder, urethra, skin, and lungs?

Which body system includes major organs such as kidneys, ureters, bladder, urethra, skin, and lungs?

• A. Digestive system
• B. Excretory system
• C. Nervous system
• D. Immune system

Answer: (B)

Excretion is the process of removing metabolic wastes from the body and balancing fluids and electrolytes. The kidneys, ureters, bladder, and urethra form the urinary tract, which is the core of excretion. The skin also helps by releasing waste through sweat, and the lungs expel carbon dioxide and water vapor. Together, these routes remove waste products and help maintain internal balance, which is the job of the excretory system. The digestive system is mainly about nutrient processing and solid waste elimination, the nervous system coordinates activities, and the immune system defends against pathogens, so they aren’t the system described here.

Excretion is the process of removing metabolic wastes from the body and balancing fluids and electrolytes. The kidneys, ureters, bladder, and urethra form the urinary tract, which is the core of excretion. The skin also helps by releasing waste through sweat, and the lungs expel carbon dioxide and water vapor. Together, these routes remove waste products and help maintain internal balance, which is the job of the excretory system. The digestive system is mainly about nutrient processing and solid waste elimination, the nervous system coordinates activities, and the immune system defends against pathogens, so they aren’t the system described here.