Excretory system of human beings includes a pair of kidneys, a pair of ureters, a urinary bladder and a urethra. Kidneys are located in the abdomen, one on either side of the backbone.
Diaphragm is a tissue of internal muscle that separates thorax and abdomen of mammals. Abdomen comprises digestive organs like stomach, small intestine, large intestine with caecum and appendix, liver, gall bladder, pancreas and spleen; organs of urinary system like kidneys and ureters.