The job of the excretory system is to remove various produced by the body. The removal is known as excreation. It is important for the body to remove these various waste, also known as toxic, because toxic build up can lead to servere death.
About sixty percent of your body contains water. A portion of the water is in the tissues and cells. The word excretion means the removal of waste substances from the body. Several organs are involved with the excretory system, including the kidneys, sweat glands, lungs . and rectum, The primary organs of excretions, however, are the kidney. Excretion is vital to the health of the body because the wastes are poisonous. If the wastes build up and are not eliminated, they can cause serious problems. As you know , carbon dioxide and water vapor are removed by the lungs.
Other wastes , namely urea, uric acid, various salts, and assorted nitrogenous wastes , are removed by the kidneys and sweat glands. Urea is produced when protein is broken down to glucose. The nitrogen part is the urea which is toxic to our body.
The water contains salt. the salt needs to be kept at the right concentrations. If there is little salt the body feeds it more, if there is too much salt the body gets rid of the salt not needed. This is the task of the two Kidneys.
The liver acts as a filter for the blood. It cleans out toxic waste and acid in the blood.
The skin plays a major role in excretion. It helps the body get rid of excess water, salts, and waste such as urea.
Urethra leads urine from bladder to outside, therefore it is also part of the excretory system.