ScienceCâu 78 / 120
The kidneys are the primary organs of which body system?
a.Respiratory system
b.Digestive system
c.Nervous system
d.Urinary system
Giải thích
The kidneys are the main organs of the urinary (renal) system, filtering blood to remove waste and excess water, forming urine. They also help regulate blood pressure and electrolytes.
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