The nervoys system consists of two parts the central nervous system and the peripheral nervous system, , The sensory organs send nervous message to the brain through the sensory nerve, , when we perform an action after thinking we speak of voluntary action, , kidneys are located in the abdominal cavity, , the kidneys filter the blood and release the urine that contains water and toxic wastes, , The urine flows from the ureters and accumhlates in the bladder. , .

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