The excretory materials

The excretory materials are carbon dioxide , nitrogenous wastes , excess salts and excess water , They are the waste materials which produced inside the cells and the body must get rid of them .

Carbon Dioxide

When the body cells burn the digested food ( carbohydrates or starch ) by oxygen to produce the energy, carbon dioxide is produced with the water vapor , And we can get rid of them through the  two lungs by the exhalation process .

Nitrogenous wastes

The nitrogenous wastes are produced from breaking down of the proteins  which are necessary for the growth of the body and repairing the damaged tissues , They are urea and uric acid , And we can get rid of them through the urinary system .

The excess salts and the excess water

The body gets rid of the excess salts by dissolving them in the excess water . We can get rid of them through the urinary system and the skin .

The excretory organs .

How do your body cells get rid of the excretory materials ?

When the body cells produce the wastes , they release them to the blood through the thin walls of the blood capillaries .

The blood carries these wastes to the special organs to get rid of them , where carbon dioxide and the water vapour are exhaled from the two lungs .

Nitrogenous wastes ( urea and uric acid ) are removed by the two kidneys ( the urinary system ) .

Your kidneys are composed of 1 million cells called Nephrons  , These long coiled tubes are where the blood is actually filtered and the urine is produced .

The excess salts and the excess water are expelled outside the body through the skin in the form of the sweat and the urinary system in the form of urine .

The excretory system is the body system that separates and gives off the waste from the body , usually as the urine or the sweat .

The skin is one of the excretory organs as it gets rid of some excess salts and excess water in the form of the sweat .

The body cells release their wastes into the blood as the blood carries these wastes to special organs to get rid of them .