Question

explain the structure of life cycle entamoeba histolytica with briefly of only 3 stages don't copy from Google ​

Answer 1

Answer:

Explanation:

Infection by Entamoeba histolytica occurs by ingestion of mature quadrinucleate cysts in fecally contaminated food, water, or hands.The quadrinucleate cyst is resistant to the gastric environment and passes unaltered through the stomach

Life Cycle of Entamoeba histolytica (Source: CDC)

Life Cycle of Entamoeba histolytica

(Source: CDC)

When they cyst of E.histolytica reaches caecum or lower part of ileum excystation occurs and an amoeba with four nuclei emerges and that divides by binary fission to form eight trophozoites.

Trophozoites migrate to the large intestine and lodge in to the submucosal tissue.

Trophozoites grow and multiply by binary fission in large intestine (Trophozoite phase of life cycle is responsible for producing characteristics lesion of amoebiasis).

Certain number of trophozoites are discharged in to the lumen of the bowel and are transformed into cystic forms.

The cysts thus formed are unable to develop in the same host and therefore necessitate a transference to another susceptible host.The cysts are passed in the feces. I am a teacher of kv you go on my waste and also know about them thank you:https://microbeonline.com/entamoeba-histolytica-life-cycle-diseases-laboratory-diagnosis/

Answer 2

HEYA MATE HERE U GO.

❤. Entamoeba histolytica ❤

• Is a monogenetic histoic parasite.
• It inhabits in the large intestine of man.
• It causes amoebic dysentery (or intestinal amoebiasis).

⭐. PHYLUM : protozoa .

⭐. SUBPHYLUM : Sarcoastigophora.

⭐. CLASS: Rhizopodea.

❤. Structure of Enamoeba histolytica in its life cycle ❤

⭐. It consists of 3 stages They are.

• Trophozoite stage.
• Precystic stage.
• cystic stage.

❤. TROPHOZOITE STAGE ❤

• This is the most active , motile , feeding and pathogenetic stage.
• It lives in mucous and submucous layers of large intestine of man.
• Its body is surrounded by plasmalemma.
• Its Cytoplasm is differentiated into i) an outer clear viscous , non- granular ectoplasm and ii) the inner fluid with granular endoplasm .
• Endoplasm contains ribosomes , food vacuoles with RBC , a cart wheel shaped nucleus.
• It respired anaerobically.
• The mode of nutrition is holozoic.
• It produces the proteolytic enzyme called histolysin.(tissue digesting enzyme).

❤. precystic stage ❤

• It is the non - feeding , non motile and non pathogentic stage.
• It is found in the lumen of large intestine.
• At this stage , it becomes small and oval.
• Its cytoplasm consists of glycogeb granules and chrimatoid bars.They act as reserve food.

❤. Cystic stage ❤

• It is round in shape.
• It is found in the lumen of large intestine .
• A thin , delicate highly resistant cyst wall is formed around the parasite.This pricess is encystation.
• The nucleus undergoes two mitotic divisions and four nuclei are formed .Hence it is called tetra nucleate cyst.This is the infective stage to man.
• These cysts pass through the faces and wait until they reach a health person.