After digestion the nextstep is absorption done bycells of the mucous membraneof the intestine. For this task alarge absorption surface is anadvantage. How is it possiblein the small internal space ofthe body of a pluricellularorganism to present a largeintestinal surface?
After digestion the next
step is absorption done by
cells of the mucous membrane
of the intestine. For this task a
large absorption surface is an
advantage. How is it possible
in the small internal space of
the body of a pluricellular
organism to present a large
intestinal surface?
Nutrition is a process through which we acquire food that is necessary to generate energy through respiration. Energy is required to perform all the functions necessary to stay alive. It is also essential for the growth and development of the body. In the holozoic type of nutrition, the ingestion of raw material takes place followed by digestion, absorption, assimilation and egestion.
Digestion is a process through which we drive glucose from the raw material we eat. The food we eat contains carbohydrates, proteins, fats, vitamins, and minerals. They all are complex substances. The carbohydrates are broken down into disaccharides and monosaccharides. Fats are broken down into fatty acids and glycerols. Proteins are polypeptides and are broken down into dipeptides and then further into amino acids.
These simpler molecules are absorbed by the blood vessels and lacteals and transported to the cells where the synthesis of ATP takes place in the presence of oxygen.
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