<prompt> Normal urea excretion rate is-1-2 gm per day10-20 gmday20-40 gm per day50-100 gmday  <response>: Ans. is b i.e., 10-20 gmday The physiologically normal individual excrete 12-20 gm of urea nitrogen in 24 hours However, excretion varies according to various factors, like nutritional status, dietary intake of proteins, physical activity level etc. 