Difference Between Egestion and Excretion


Main Difference

The main difference between Egestion and Excretion is that Egestion is the discharge of undigested food material from the body of living organisms, whereas Excretion is the discharge of metabolic waste from cell formed by chemical reaction of the body, such as in sweat, urine, etc.

Egestion vs. Excretion

Egestion is the passing out of undigested material from the body in the form of feces, through the anus while Excretion is a common term discussing the separation and throwing off toxic substances or waste materials from the body and tissues of a plant or animal. Egestion is the act of excreting useless or undigested material from a cell or the digestive tract in a unicellular or multicellular organism whereas Excretion is the elimination of waste products and toxic materials of excess substances and metabolism from organisms. Egestion occurs through mouth and anus, and excretion occurs from three major organs like the kidney, skin, and lungs. Excretion control osmotic pressure in the organism. Egestion is the final stage of feeding and contains undigested food, mostly cellulose in humans at the end of the alimentary canal is being passed out of the anus as feces whereas excretion is an important process for maintaining the digestive system in all living forms. Egestion is simply passing out undigested food from the end of the large intestine in the form of feces while wastes of excretion release in the form of urine and sweat. Egestion is carried out only in the animals on the contrary excretion is carried out both in plants and animals.


Comparison Chart

Discharge of undigested food material from the body of a living organism.Rid of metabolic wastes by chemical reaction from the body.
Eliminate undigested waste material from the body.Eliminate metabolic wastes products from the body.
Egestion occurs through the anus and mouth.Excretion occurs through the nose, lungs, and skin.
The final event in feeding.An essential process in all living organism.
Helps to remove unwanted materials.Helps to remove chemical wastes.
Carried out only in animals.Carried out both in plant and animals.
Cells Involvement
Discharged has not passed through the cells.Discharged material has passed through the cells.
FecesDigestive enzymes, sweat, hormones

What is Egestion?

Egestion refers to the removal of the undigested material of food from the body. It is the final stage of feeding animals. Feces may contain complex food like fibers, pathogens as well as dead cells. Egestion may help to remove semi-solid feces by the digestive tract through the anus in animals. Sometimes before elimination Egestion is made in the large intestine and is stored in the rectum. Egestion occurs by exocytosis in protozoans. The egestion process is as follows: Indigestible materials are pushed to large intestine by peristalsis. Electrolytes and water have absorbed from the chyme. Undigested food material is fed by E-coli in the colon and produces vitamin B12, Vitamin K, B1, and B2. Chyme gets converted into semi-solid feces. Pellets of feces enter the rectum. Reflex action occurs through peristalsis in colon and rectum, pushing forces to move feces towards the anus. As the feces reach anus, involuntary relaxation cause defecation and voluntary action cause feces to expelled through the anus.

What is Excretion?

Excretion refers to the discharge of metabolic wastes from the body produced by plants and animals. Excretion is an essential process of all life forms. Skin, kidneys, and lungs are three major organs of excretion. Sweat glands produce sweat in the skin. Excretion material contains, urea, water, and salt. Excreting sweat helps retain the body cool in hot environments. When breathing, the lungs remove some water and excess carbon dioxide. Excretions occur through the kidneys remove excess water, salts, and urea to inhibit a contaminated build-up of these elements in the body. Wastes can consist of metabolic waste products and nitrogenous by-products such as, excess water, excess salts, carbon dioxide ammonia, urine, and sweat through which the organisms control osmotic pressure. Excretion also helps in promoting homeostasis. Plants excrete excess water by guttation and transpiration. The leaf drops in plants are also by excretion process. These are known as Excretophores. Saps and gums are the types of excretion in plants. Excretion is carried out both in plants and animals. The excretory system expels toxic wastes which otherwise accumulate in the body of human beings. Excretion helps through sweating in maintaining the body temperature of humans. Dogs have a limited number of sweat pores, and they use panting for the discharge of excess body temperature.

Key Differences

  1. Egestion is the process of discharging undigested material from the body whereas Excretion is getting rid of waste produced by plant and animals from the body.
  2. Egestion is the elimination of wastes from the body while excretion is the removal of metabolic waste from the body.
  3. Egestion is the final event of feeding, but Excretion is an essential process for removing metabolic wastes in all life form.
  4. Egestion is carried out through anus and mouth, on the other hand, Excretion is carried out through mouth nose skin and urethra.
  5. Egestion process is carried out only in animals, on the contrary, Excretion is carried out both in animals and plants.
  6. Egestion is the process in which discharged is not passed through cells, on the flip, in excretion discharged is passed through the cells.


According to the above discussion, it concludes that Egestion is the process of discharging wastes material from the body and excretion is the process of removal of metabolic wastes produced by plants and animals.

Janet White

Janet White is a writer and blogger for Difference Wiki since 2015. She has a master's degree in science and medical journalism from Boston University. Apart from work, she enjoys exercising, reading, and spending time with her friends and family. Connect with her on Twitter @Janet__White