List and briefly describe the five steps of digestion?
Answers
The five steps of digestion are as follows in the order of digestion of food:
1. Ingestion: It is the entry of food into the mouth. Chewing breaks the food into small pieces and saliva mixes with food that can be easily passed through to the stomach through the oesophagus.
2. Digestion: When food enters into the stomach the inner lining of the stomach secretes mucous, hydrochloric acid, and digestive juices. The acid makes the medium in the stomach acidic and helps the digestive juices which break down the proteins into simpler substances.
The small intestine receives secretions from the liver and the pancreas to breakdown the carbohydrates, fats and proteins the digestion.
3. Absorption: The digested food passes into the blood vessels in the wall of the intestine which has thousands of finger-like outgrowths. These are called villi which increase the surface area for absorption of the digested food.
4. Assimilation: The absorbed substances are transported to different organs via the blood vessels. These substances are used to build complex substances like proteins. This is called as assimilation.
5. Egestion: The undigested and unabsorbed food enters into the large intestine where it water and some salts get absorbed from the undigested food material.
The remaining waste passes to the rectum. This faecal matter is removed through anus. This is called egestion.
Answer:
Most animal take food into the body through the mouth. This mode of feeding is called holozoic nutrition.Holozoic nutrition occurs in five stages .
ingestion→ digestion →absorption→ assimilation→ Egestion.
Ingestion
Ingestion is the process by which an organism takes food into its body Different animals ingest food differently. Most of the animals have special organs to ingest food.
Digestion
The food taken in by animals is normally complex. The cells in an animal's body cannot absorb food in this form. Hence, they have to break down the complex food into simple. soluble substances with the help of digestive juices produced in the body. The process of converting complex food into a simple and soluble form is known as digestion. Most animals se physical and chemical methods for digesting food.
Absorption
It is the proces by which the digested food is passed into the blood so that it can be transported to different parts of the body by the circulatory system.
Assimilation
It is the process through which the absorbed food is utilised for energy growth and development.
Egestion
It is the process by which undigested food material in the form of faeces a removed from the body.
Different animals have different body structures. Therefore, the process of nutrition will also be different in them.
Explanation:
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