Answer:Urea is the most abundant organic compound in urine.The kidney helps to regulate acid-base balance in the body; therefore, hydrogen ions are a normal component of urine.Creatinine is produced at a constant rate by the muscles; the measure of the amount of creatinine in the urine is a good indicator of glomerular filtration rate because it is filtered and not reabsorbed or secreted.Amino acids are normally present in the glomerular filtrate, and 95% are reabsorbed in the tubules. Thus, a small amount of amino acids would be expected in the urine. High levels of amino acids in the urine might indicate a disorder of amino acid metabolism.