The composition of glomerular filtrate and urine is not same. Comment.
Water and electrolytes are present in the glomerular filtrate in large quantities. The GFR is 180 L/day for a healthy human. The urine output on average for a healthy human is 1.5 L/ day. So, we can deduce that there is a reabsorption of 90% or more glomerular filtrate. This reabsorption happens to retain the water and electrolytes in the body. This means the concentration of urine is higher than the glomerular filtrate, and that is what makes their compositions different from each other.