Difference between Excretion and Egestion
The human body is a varied mechanism. The combination of veins, arteries, capillaries, muscles, white blood cells, red blood cells, etc., makes the human body. In general terms, the human body is nothing but an accumulation of food and water. The food and water that we intake make the strength of the body. The body remains in a stable position due to the food we eat. Eating is an intrinsic process. Another important process is excretion. It is essential for the food to come out of the body that we eat. The waste material must come out of the body in order to make it healthy and stable. Now, there are many processes associated with the body. Today we will be discussing about two such processes, i.e., excretion and egestion. Many of us are often confused about these two terms as they mean somewhat the same. But it is not so. They both are different in some aspects. So, let us first look at the definition of excretion and egestion.
Excretion is defined as the process wherein metabolic waste is released from the body. In vertebrates, this process is carried out through lungs, skin, kidneys, etc. Excretion is necessary for all life forms. For example, urine is excreted through the urethra in mammals. Thus, the urethra is a part of the excretory system.
Similarly, the waste is excreted through the cell's surface in unicellular organisms. The body of an animal or a human consists of metabolism. Now, what is metabolism? Several chemical reactions take place in the body during cellular respiration. These reactions are called metabolism. The chemical reactions produce many waste materials like carbon dioxide, salt, urea, water, uric acid, etc. These chemicals are accumulated in the body that is very harmful. Therefore, it becomes necessary to extract this waste from the body. That is why the process of excretion is essential. The process of extracting/ releasing the metabolic waste from the body is known as excretion. In plants, waste material like water and carbon dioxide is excreted through stomata and root cell walls. This waste material is released during respiration. In animals, the waste materials like ammonia, carbon dioxide, guanine, uric acid, etc., are released through the liver and kidneys. The liver and kidneys extract almost all waste material. But the remaining waste materials are released through feces and urine. Well, there are several kinds of excretion, namely ammonotelism, ureotelism, aminotelism, guanotelism, etc., which we will discuss later.
Egestion is defined as the process of excretion of undigested food from the body. In single-celled organisms, the waste material is released through a cell, while in multi-cellular organisms, the waste material is extracted through the digestive tract. Egestion is also known as defecation. Egestion takes place when the absorption is completed in the body. The waste material that is stored in the large intestine passes through the rectum and is released by the body through the anus. Well, egestion is not considered to be excretion. This is so because egestion involves the extraction of undigested food from the body. Excretion is the extraction of waste material. Therefore, egestion cannot be related to excretion. Both are different in some aspects. So, let us discuss the contrasting points between them.
So, these are some contrasting points between excretion and egestion. However, both processes are essential as they extract the waste material from the organisms. Excretion and egestion are the fundamental aspects of life. If these processes do not take place, then they can be harmful to the organisms. Now, excretion and egestion have certain advantages/ importance. So, let us take a look at them.
Importance of Excretion
Importance of Egestion
So, these are some points regarding the egestion and excretion. Both these processes take place in multi-celled and single-celled organisms. These processes need to happen; otherwise, the body can be affected in a negative way. Thus, egestion and excretion are essential for organisms.