Question

The breakdown of complex components of food into simple ones is called as
A. Respiration
B. Digestion
C. Excretion
D. Absorption

Answer 1

Hint: We take food from the environment by ingesting them.
Ingested items converted into simple compounds in our digestive system and those help to gain nutrition.

Complete answer: Process of the breakdown of large insoluble food molecules into smaller water-soluble molecules is called digestion.
1. Briefly, it is the process of breakdown of complex components of food into simple ones.
2. The human digestive system digests food to release energy essential for carrying out various activities of the body.
3. In human beings, the digestion process starts within the mouth. Ingested food is physically broken down and carbohydrate digestion also occurs by salivary amylase enzyme. 4. Protein digestion occurs in the stomach and small intestine.
5. Trypsin works in the duodenum to digest proteins and peptides.
6. Fat digestion entirely takes place in the small intestine by lipase.
7. Other carbohydrates such as fructose, maltose are digested in the ileum portion by sucrose, maltase, etc.

Additional information: Our digestive system consists of Alimentary canal and associated digestive glands.
The alimentary tract of the digestive system consists of the mouth, pharynx, esophagus, stomach, small and large intestines, rectum, and anus.
Associated digestive glands include salivary glands, liver, gallbladder, and pancreas.
They are essential for our body functions and the maintenance of health. The digestive system breaks down food so that it is small enough to be absorbed and easily used by the body. It transfers nutrients from the external environment to body fluids and removes undigested food residues as feces.

So, the correct option is B. Digestion

Note: The digested food particles are assimilated. After assimilation, they provide us nutrition and also take part in metabolism processes. The metabolic wastes are taken away to the external by excretion.