What are Entamoeba histolytica trophozoites?
Entamoeba histolytica is a parasitic amoeba belonging to the phylum Sarcomastigophora, which has an environmentally resistant infectious stage, known as a cyst. In the intestine, cysts undergo excystation, and the intestinal stage, known as a trophozoite, is released and begins to multiply asexually.
How many trophozoites are formed from a single cyst of Entamoeba?
eight trophozoites
Life cycle of Entamoeba histolytica. Once ingested, the cyst form passes through the stomach and into the small bowel where excystation occurs. During excystation, the cyst undergoes nuclear followed by cytoplasmic division to form eight trophozoites, which then migrate to the large bowel.
What is the morphology of Entamoeba histolytica?
Entamoeba histolytica [causes amoebic dysentery in man and primates] Parasite morphology: The trophozoites are 20-30 µm in diameter and contain a vesicular nucleus with a central endosome, peripheral chromatin and radial achromatic fibrils (imparting a ‘cart-wheel’ appearance).
What is the common name for Entamoeba histolytica?
Amebiasis is a disease caused by a one-celled parasite called Entamoeba histolytica.
What is the trophozoite stage?
A trophozoite (G. trope, nourishment + zoon, animal) is the activated, feeding stage in the life cycle of certain protozoa such as malaria-causing Plasmodium falciparum and those of the Giardia group. (The complement of the trophozoite state is the thick-walled cyst form).
How many Uninucleate trophozoites are produced from a single cyst of Entamoeba histolytica?
7 Uninucleate cyst (i.e., precyst) contains chromatoid bodies and (often) a large glycogen vacuole. 8 Cysts with 2 nuclei and chromatoid bodies.
How many Uninucleate trophozoites are produced from a single infective cyst of Entamoeba histolytica?
The life cycle of Entamoeba histolytica is 1. Cysts with 4 nuclei (it means metacysts) are orally ingested with the contaminated food or drinking water (A–C). 7 A uninucleated cyst (it means precyst) contains the chromatoid bodies and often a large glycogen vacuole. 8 Cysts with 2 nuclei and chromatoid bodies.