1: ENTAMOEBA HISTOLYTICA Flashcards
Common associated disease or condition names
Intestinal amebiasis, amebic colitis, amebic dysentery, extraintestinal amebiasis
e trophozoite exhibits rapid, unidirectional,
progressive movement, achieved with the help of ______________________
finger-like hyaline pseudopods
The single nucleus typically contains a small central mass of chromatin known as _________
karyosome (karyosomal chromatin)
The karyosome of this amebic parasite is surrounded by chromatin material, a morphologic structure called ___________ ____________.
peripheral chromatin
Motility
Progressive, finger-like
pseudopodia
Number of nuclei
One
Karyosome
Small and central
Peripheral chromatin
Fine and evenly distributed
Cytoplasm
Finely granular
Cytoplasmic inclusions
Ingested red blood cells
The E. histolytica trophozoite contains a ____________ ____________ __________, which is often referred to as having a ground glass in appearance.
finely granular cytoplasm
Young cysts characteristically contain unorganized chromatin material that transforms into squared or round-ended structures called _____________
chromatoid bars
structures that contain condensed RNA material.
chromatoid bars
It is a cytoplasmic area without defined borders that is believed to represent stored food, is also usually visible in young cysts
glycogen mass
Nuclear variations during maturation
- eccentric (rather than the typical central) karyosomes
- thin plaques of peripheral chromatin, or
- a clump of peripheral chromatin at one side of the nucleus that appears crescent shaped.
The mature infective cyst is
quadrinucleated
RBCs, bacteria, yeast, and other debris are not found in the cyst stage.
True
Laboratory Diagnosis
- traditional wet preparation
- permanent staining techniques
- sigmoidoscopy procedure
- hepatic abscess material
A special medium known at ________ supports E. histolytica in culture.
TYI-S-33
Once the infective cyst is ingested, excystation occurs in the __________________.
small intestine
As a result of the nuclear division, a single cyst produces _____ motile trophozoites.
eight
These motile amebas settle
in the ______ of the large intestine, where they replicate by ________ fission and feed on living host cells
lumen, binary
Encystation occurs in the _________________
intestinal lumen
cyst formation is complete when ___ nuclei are present.
four
