1. Introduction Waste products of cellular activity must be excreted from the body Waste products of cellular activity must be excreted from the body excretion is the process of removing metabolic waste excretion is the process of removing metabolic waste the urinary system regulates the content of water and other substances in the blood, which helps maintain homeostasis the urinary system regulates the content of water and other substances in the blood, which helps maintain homeostasis

2. Functions Eliminates waste from the body Eliminates waste from the body Maintains water in the body Maintains water in the body Maintains chemical balance of the body Maintains chemical balance of the body

3. Major Structures Kidneys- play a vital role in maintaining homeostasis and body fluids. Kidneys- play a vital role in maintaining homeostasis and body fluids. Urethra- a tube where urine is forced out of the body by muscular contractions. Urethra- a tube where urine is forced out of the body by muscular contractions. Bladder- where urine is stored. Bladder- where urine is stored. Skin-excretes nitrogenous waste in sweat and water in sweat. Skin-excretes nitrogenous waste in sweat and water in sweat. Lungs- primary site of carbon dioxide excretion; carry out detoxification. Lungs- primary site of carbon dioxide excretion; carry out detoxification. Ureters- a tube that leads from the kidneys to the urinary bladder Ureters- a tube that leads from the kidneys to the urinary bladder