1. The excretory system in human beings includes a pair of kidneys, a pair of ureters, urinary bladder and urethra. Kidneys remove the waste products from the blood and form urine.
2. Kidneys are two bean shaped structures located at the back of the abdomen, one on either side of the vertebral column. The right kidney is placed slightly lower than the left kidney.
3. Though the kidneys are the major excretory organs in a human being, the skin and the lungs also help in the process of excretion.
4. An average person has around 5 litres of blood which the kidneys filter about 400 times in a day. Kidneys filter out about 190 litres of filtrate daily to produce 1-1.9 litres of urine, rest is reabsorbed.