Explain why the main nitrogenous excretory product of humans is urea rather than ammonia?

excretory-products
nitrogenous

#1

explain why the main nitrogenous excretory product of humans is urea rather than ammonia?

Answer:

Ammonia is much less soluble in water than its larger and more polar cousin, urea, so the human body fixes nitrogen into urea instead. When it does this, it also exports twice as much nitrogen per molecule (NH3 vs CH4N2O), so it all boils down to efficiency.