Difference Between Egestion And Excretion

What Is Egestion?

Egestion is the expulsion of indigestible substances from the body. It occurs through the digestive tract and the waste is removed in the form of faeces. It takes place mainly through the colon, rectum and anus. This process is the final step of nutrition and important for the removal of non-absorbable products from the gastrointestinal tract and, thus, the wellness of the GI system.

What Is Excretion?

Excretion is the process by which metabolic waste products are eliminated from the body. Thus, it includes processes such as the removal of waste products from the blood by the renal cortex to form urine, the expulsion of gases from the lungs to form carbon dioxide and the secretion from sweat glands. Excretion is a continuous and vital life process since it ensures that the body has a constant steady temperature and helps remove unwanted substances.

Mechanisms of Egestion

The mechanism of egestion is described below-

Role of Digestive System

• The digestive system’s main function in egestion is the breakdown of food, absorption of nutrients in the food and discharge of wastes.

• The nutrients are absorbed through the small intestine.

• The food which is not digested is subjected to processes that facilitate egestion as faeces.

Pathway of Undigested food

• Beginning from the mouth to the stomach, the small and large intestines and finally the rectum.

• After it has advanced through the small intestine and large intestine, the food is converted to faeces by absorbing water and solidifying.

Organ Involved in Egestion

• Organs involved in egestion are colon, rectum and anus.

Mechanisms of Excretion

The mechanism of excretion is described below-

Role of Excretory System

• It ensures the expulsion of waste products from the body making sure internal chemical balance is well maintained.

• It purifies blood and uptake of various necessary elements and expels unwanted products through different excretory organs.

Pathway of Metabolic Waste

• By-products of metabolism for example urea, carbon dioxide and excess salts move from the cells in which they are found into the bloodstream.

• It is then transported to the excretory organs where it is then metabolized and expelled out of the body.

Organ Involved in Excretion

• The kidneys filter blood to produce urine, and the sure, as well as other wastes, are filtered out.

• The liver, this organ detoxifies and creates bile.

• Carbon dioxide is expelled in the lungs as a result of respiration.

• Sweat is salty water and is excreted through the skin.

• These organs assist in the efficient elimination of waste products from the body system.

Difference Between Egestion and Excretion

It is one important difference and comparison article in biology. The differences are listed below-

Egestion vs Excretion NEET MCQs (With Answers & Explanations)

Important questions asked in NEET from this topic are:

• Process of Egestion and Excretion

• Egestion vs Excretion

Practice Questions for NEET

Q1. Absorbed substances finally reach the tissues which utilise them for their activities , this process is called

1. Assimilation

2. Absorption

3. Digestion

4. Mastication

Correct answer: 1) Assimilation

Explanation:

Assimilation is the process by which absorbed nutrients are delivered to the cells and tissues that need them for various functions. After digestion and absorption, nutrients such as glucose, amino acids, and fatty acids are transported through the bloodstream to different cells throughout the body. This process takes place at the cellular level in organs like the liver, muscles, adipose tissue, and other target cells.

Hence, the correct answer is option 1) Assimilation.

Q2. Which of the following statements is incorrect?

1. Faecal accumulation in the rectum initiates a neural reflex causing an urge for its removal.

2. Irregular bowel movements cause constipation.

3. In diarrhea absorption of food is increased.

4. All of the these

Correct answer: 3) In diarrhea absorption of food is increased.

Explanation:

The digestive wastes, solidified into coherent faeces in the rectum initiate a neural reflex causing an urge or desire for its removal. The egestion of faeces to the outside through the anal opening is called defecation. It is a voluntary process and is carried out by a mass peristaltic movement

Hence, the correct answer is Option (3) In diarrhoea absorption of food is increased.

Q3. Removal of digestive wastes, solidified into coherent feces in the rectum initiates a neural reflex causing an urge or desire for its removal the process is known as:

1. Ingestion

2. Defaecation

3. Egestion

4. Assimilation

Correct answer: 2) Defaecation

Explanation:

The above process is termed the defecation reflex. Thus, when the rectum is filled with fecal matter, it activates the stretch receptors and sends information to the brain, initiating an urge to move it out. It is also, therefore, a process consisting of both involuntary and voluntary actions within the muscles that expel waste from the body.

Hence, the correct answer is option 2) Defaecation.

Also Read:

• MCQs on Assimilation and Egestion

• Digestive Glands

• Alimentary Canal

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