what is meant by intracellular digestion & extra cellular digestion?

Answer 1

Intracellular digestion:
It occurs within the cell. The enzymes that help are those of lysosomes.Intracellular digestion can be seen in sponges, hydra etc.
Extracellular digestion:
It occurs in the alimentary canal with the help of enzymes poured into it by the digestive glands.Extracellular digestion may occur anywhere but not inside the cell.

Answer 2

Extracellular Digestion Definition

Answer 3

Intracellular Digestion

Answer 4

The first answerer misread the question.

IntRAcellular digestion is the breaking down of food molecules by enzymes within a cell. This is often done in the lysozomes. These are small organelles with potent denaturing proteins that must be isolated from the rest of the cellular constituents in order to prevent the cell from digesting itself.

As for the second part: notice that both answerers have the same phrasing? Wonder where they got that - they didn't cite any sources.

Extracellular digestion would be when the enzymes necessary to break down the food molecule (organic or not) are outside the cell.

Answer 5

intracellular digestion : A form of digestion in which food is taken into cells by phagocytosis; found in sponges and most The primary sites of intracellular digestion are organelles known as the lysosomes, which are membrane-bounded compartments containing a variety of hydrolytic enzymes. Lysosomes maintain an internal acidic environment through the use of a hydrogen ion pump in the lysosomal membrane that drives ions from the cytoplasm into the lumenal space of the organelles. The high internal acidity is necessary for the enzymes contained in lysosomes to exhibit their optimum activity. Hence, if the integrity of a lysosomal membrane is compromised and the enzymatic contents are leaked into the cell, little damage is done due to the neutral pH of the cytoplasm. If numerous lysosomes rupture simultaneously, however, the cumulative action of their enzymes can result in autodigestion and the death of the cell.

Extra-cellular Digestion is a process where saprobionts feed by secreting enzymes through the cell membrane onto the food. The enzymes catalyse the food into molecules small enough for them to be diffused into the cell. Since digestion is done outside the cell, it is said to be extra-cellular.

Extracellular digestion is form of digestion found in all saprobiontic annelids, crustaceans, arthropods and chordates, including vertebrates. It takes place within the lumen of the digestive system, and the resulting nutrient molecules are transferred into the blood or body fluid

Answer 6

Intra-cellular digestion : A form of digestion in which food is taken into cells by phagocytosis; found in sponges and most protozoa and coelenterates.

Extra-cellular digestion : Aprocess where saprobionts feed by secreting enzymes through the cell membrane onto the food. The enzymes catalyze the food into molecules small enough for them to be diffused into the cell. Since digestion is done outside the cell, it is said to be extra-cellular.

Answer 7

Digestion
physical break-up of food
chewing, crops
chemical processing of three main macromolecule types
breaking macromolecules into component parts
each requires particular set of enzymes
carbohydrates (amylase)-> sugars
examples: starch, sugar
proteins (protease)-> amino acids
fats (lipase)->glycerol and free fatty acids
Digestion occurs in all heterotrophic organisms
Intracellular digestion
macromolecules taken up via endocytosis
examples: amoebae, Paramicium, some sponges
Extra cellular digestion
macromolecules digested outside of cells
component parts absorbed via active transport, diffusion
advantage: keep digestive enzymes outside of cell
disadvantage: surface area: volume limitations
some example digestive tracks
evolutionary trend towards increased complexity

Digestion is, technically, the hydrolysis (breaking down) of macromolecules into the corresponding subunits. This can happen extracellularly or intracellularly. In most animals animals, large food particles are taken into a chamber in the body where hydrolysis begins (extracellular). At some point, food particles or molecules are small enough to be taken into the cells (either by phagocytosis or endocytosis or by absorption [diffustion or active transport]). Intracellularly, the macromolecules are often further hydrolyzed within specific cellular compartments. Both extracellular and intracellular digestion must be compartmentalized so that enzymes involved in macromolecular degradation can be sequestered to prevent them from degrading the rest of the cell or body.

Answer 8

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RE:
what is meant by intracellular digestion & extra cellular digestion?

Answer 9

Extra-cellular digestion : Aprocess where saprobionts feed by secreting enzymes through the cell membrane onto the food

Answer 10

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food is captured by the tentacles, stung with the cnidocytes, and then transferred to the mouth and coelenteron for initial extracellular digestion. This is followed by intracellular digestion as molecules and food particles are distributed by gastrodermal ciliary currents in the coelenteron and then endocytosed by gastrodermal cells Undiges­ted food vacuoles are exocytosed into the coelenteron and then voided through the mouth, which is thus the anus also. Notice again the cnidocyte batteries on the tentacles. The mouth in hydra is temporary, being present only when there is food to ingest.