Which of the following statements is INCORRECT?
1
The human excretory system includes a pair of kidneys, a pair of ureters, a urinary bladder and a urethra.
2
Each kidney has large numbers of the filtration units called neurons packed close together.
3
Normally, in a healthy adult, the initial filtrate in the kidneys is about 180 L daily
4
Kidneys are located in the abdomen, one on either side of the backbone