Human excretory system

EXCRETORY  SYSTEM

WHAT IS EXCRETION?

There are various metabolic activities take place inside our body.As a result of which many wastes or  substances such as carbon-di-oxide,

urea and excess water are formed.This process of removal of toxic wastes from our body of an organism from time to time is called excretion

EXCRETION is the process of removal of metabolic wastes from the body of an organism through the excretory organs.

EXCRETORY ORGANS OF HUMAN  BEINGS.

Several organs take part in excretion in human being.Along with the lungs,skin,liver and kidneys are the chief excretory organs of the human body let's discuss about the excretory organs of the human beings 

LUNGS

Being a respiratory organ also serve as excretory organs because they help to get rid of carbon-di-oxide by the process of exhalation excess water also leaves the lungs as water vapour.

KIDNEYS

These are the main excretory organs which help in removal of nitrogenious,toxic wastes along with excess water and dissolved mineral salts from the body in the form of urine.

SKIN

Most of the salts are carried by the blood transport system to the kidneys and some are excreted by the skin when perspire,sweat glands in the skin excrete salts water and some urea in the form of sweat in this way sweat also functions as an excretory system.

LIVER

The liver breaks down the red blood cells and produce the excretory ,yellow-green colored bile pigments.These bile pigments release with the bile juice into the duodenum of small intestine are 

eventually removed from the body along with the faces.

EXCRETORY PRODUCTS

In the human body mainly 3 types of products are produced.These are water,carbon dioxide and urea.

CARBON DIOXIDE

It is the end-product of respiration and produced by all the cells during respiration. Approximately 85 per cent of it is transported through the blood plasma as sodium bicarbonate to the alveoli of the lungs, where it is diffused into the air during exhalation. Approximately, 10 per cent of carbon dioxide is carried away as potassium bicarbonate by the red blood cells. 

WATER

It is also the end-product of respiration. Along with the blood stream, it reaches to the kidneys where it is removed as urine. Some of excess water is removed as sweat from the body.

UREA

In the lever, excess proteins get converted into urea. Body cannot store excess proteins which are broken down into amino acids and then urea. These are carried with the blood to the kidneys, from where they are excreted with the urine.

 Excretory organs and excretory products

Excretory organ	Excretory products	Notes
Kidneys	Nitrogenous metabolic wastes such as urea, water, excess salts and extra medicines	As urine
Liver	Bile pigments	From the breakdown of worn out red blood cells
Lungs	Respiratory wastes such as carbon dioxide and some amounts of water	From respiration in the cells
Skin	Excess water and dissolved salts	Removed by the sweat glands