What Is Intracellular Digestion?

Intracellular digestion can be divided into intracellular digestion and extracellular digestion. Foods ingested by unicellular animals such as Paramecium are broken down by various hydrolytic enzymes in the cell, called intracellular digestion (porous animals are the same as protozoa, they undergo intracellular digestion, and sponges are the first case in multicellular animals). Multicellular animal food is taken from the mouth of the digestive tube and digested in the digestive tube is called extracellular digestion. Extracellular digestion is more efficient because it can digest large amounts of and more chemically complex foods. However, even in the bodies of higher animals (such as humans), intracellular digestion is still partially retained, such as leukocytes engulf foreign bodies in the body and dissolve foreign bodies in the cells.

Intracellular digestion

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Intracellular digestion can be divided into intracellular digestion and extracellular digestion. Foods ingested by unicellular animals such as Paramecium are broken down by various hydrolytic enzymes in the cell, called intracellular digestion (porous animals are the same as protozoa, they undergo intracellular digestion, and sponges are the first case in multicellular animals). Multicellular animal food is taken from the mouth of the digestive tube and digested in the digestive tube is called extracellular digestion. Extracellular digestion is more efficient because it can digest large amounts of and more chemically complex foods. However, even in the bodies of higher animals (such as humans), intracellular digestion is still partially retained, such as leukocytes engulf foreign bodies in the body and dissolve foreign bodies in the cells.
Chinese name
Intracellular digestion
Foreign name
intracellular digestion)
Representative creature
Paramecium
Nature
A way of digestion in cells
main feature
Food digestion is a type of digestion performed in the body of cells. For example, amoeba phagocytosis and puffing are both intracellular digestions. After the amoeba met the food particles, it extended the pseudofoot to wrap the food, forming a food bubble. In the body of the cell, the food bubble is fused with the lysosome, and various acid hydrolyzing enzymes of the lysosome break down the macromolecules of the food for use by the cell. This is the intracellular digestion of solid food. Puffing refers to the uptake and digestion of liquid substances. After some macromolecular compounds or ions in the liquid environment are adsorbed on the surface of the plasma membrane, the cell membrane immediately sinks into the cell to form tiny channels; then the inner end of the channel breaks down in sections to form most of the small vacuoles, which are associated with The body is combined into a multivesicular body. Liquid macromolecular compounds are broken down and nutrients are distributed to all parts of the cell. Intracellular digestion is a form of digestion in lower animals. Protozoa only have intracellular digestion, and sponges, coelenterates, and flat animals also retain this type of digestion. Some cells of other multicellular animals also have intracellular digestion. As the animal evolved, it was gradually replaced by extracellular digestion. Extracellular digestion began to occur from coelenterate animals. In addition, intracellular digestion is mainly performed in the pyloric caecum in echinoderms, which also shows that intracellular digestion has not completely degraded during the animal's subsequent evolution.

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