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  • Mar 27, 10

    excellent comment on core concept

    • The kidneys filter and remove waste and water from the blood to produce urine.  They get rid of about 1-1/2 to 2 quarts of urine per day in an adult and less in  a child, depending on the child's age. The urine travels from the kidneys down  two narrow tubes called the ureters. The urine is then stored in a balloon-like  organ called the bladder (see figure
    • The opening of the urethra is at the end of the penis in boys (see figure 2) and  in front of the vagina in girls (see figure 3).

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