Nitrogenous waste(ammonia) is formed in the cell and then it transport to the liver by blood. it is formed because nitrogenous waste is a waste product and it is really toxic, our body need to get rid of it as soon as possible PS:if you are talking about human
The nitrates in nitrogenous waste reduce the oxygen carrying capabilities of the haemoglobin in the blood of animals. Since plants do not have haemoglobin they can absorb it to help them make proteins.
The urinary system or renal system removes liquid and waste from the blood and transports them to the outside of the body. The kidneys remove waste, from the blood, which travels down the ureters into the bladder from where it passes through the urethra as urine.
nitrogenous waste is carried through the blood. the waste passes into the nephrons (kidney cells) inside the nephrons the blood passes through "the loop of henly" in which the waste is pulled out of the blood and send to the bladder to be concentrated as urea
There are two systems that remove wastes from the body. The lower digestive tract (the colon) removes solid wastes and sodium whiles it retains water. The urinary system removes waste from the blood by way of the kidneys.