Podcast
Questions and Answers
How does the shape of Entamoeba coli trophozoites compare to that of Entamoeba histolytica?
How does the shape of Entamoeba coli trophozoites compare to that of Entamoeba histolytica?
Entamoeba coli trophozoites are more compact.
What is a key characteristic of the karyosome in Endolimax nana trophozoites?
What is a key characteristic of the karyosome in Endolimax nana trophozoites?
Large and centric or eccentric without peripheral chromatin.
Describe the typical appearance of the cytoplasm of Entamoeba histolytica trophozoites.
Describe the typical appearance of the cytoplasm of Entamoeba histolytica trophozoites.
Granulated endoplasm.
How many nuclei are typically found in the mature cyst stage of Entamoeba histolytica?
How many nuclei are typically found in the mature cyst stage of Entamoeba histolytica?
What unique structure is associated with the cysts of Entamoeba coli?
What unique structure is associated with the cysts of Entamoeba coli?
What is found in the large glycogen vacuole of Iodamoeba butschlii cysts?
What is found in the large glycogen vacuole of Iodamoeba butschlii cysts?
What is the typical shape of Endolimax nana cysts?
What is the typical shape of Endolimax nana cysts?
Describe the nuclear structure of Iodamoeba butschlii trophozoites.
Describe the nuclear structure of Iodamoeba butschlii trophozoites.
What is a key difference between the ectoplasm of Entamoeba coli and Entamoeba histolytica?
What is a key difference between the ectoplasm of Entamoeba coli and Entamoeba histolytica?
In a section of infected intestine, what cellular abnormality is caused by Entamoeba histolytica?
In a section of infected intestine, what cellular abnormality is caused by Entamoeba histolytica?
What is frequently found within the cytoplasm of Entamoeba histolytica trophozoites in infected tissues?
What is frequently found within the cytoplasm of Entamoeba histolytica trophozoites in infected tissues?
Describe the regularity of perinuclear chromatin dots in Entamoeba histolytica trophozoites.
Describe the regularity of perinuclear chromatin dots in Entamoeba histolytica trophozoites.
What type of ulcer might Entamoeba histolytica cause in the intestine, and what shape does it take?
What type of ulcer might Entamoeba histolytica cause in the intestine, and what shape does it take?
What is the range in size in micrometers for Entamoeba coli cysts?
What is the range in size in micrometers for Entamoeba coli cysts?
How many nuclei are typically contained in an Endolimax nana cyst?
How many nuclei are typically contained in an Endolimax nana cyst?
What is the identifying feature of Iodamoeba butschlii cysts?
What is the identifying feature of Iodamoeba butschlii cysts?
Name the pathogenic intestinal amoeba.
Name the pathogenic intestinal amoeba.
Name three commensal intestinal amoeba.
Name three commensal intestinal amoeba.
How is amebiasis normally contracted?
How is amebiasis normally contracted?
What shape is the Entamoeba histolytica trophozoite?
What shape is the Entamoeba histolytica trophozoite?
What are the diagnostic stages of Entamoeba histolytica?
What are the diagnostic stages of Entamoeba histolytica?
What two components make up the cytoplasm of a trophozoite?
What two components make up the cytoplasm of a trophozoite?
What is contained in the cytoplasm of some trophozoites in an infected intestine?
What is contained in the cytoplasm of some trophozoites in an infected intestine?
How many nuclei are inside a mature cyst of Entamoeba coli?
How many nuclei are inside a mature cyst of Entamoeba coli?
How does the appearance of the Karyosome in Endolimax nana compare with peripheral chromatin?
How does the appearance of the Karyosome in Endolimax nana compare with peripheral chromatin?
Flashcards
Intestinal Protozoa
Intestinal Protozoa
A group of intestinal protozoa including pathogenic and commensal species.
Amoebae
Amoebae
A type of intestinal protozoa that includes both pathogenic (disease-causing) and commensal (non-harmful) species.
Entamoeba histolytica
Entamoeba histolytica
A pathogenic amoeba known to cause amoebic dysentery and liver abscesses.
Entamoeba coli
Entamoeba coli
A commensal amoeba that lives in the human intestine without causing harm.
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Endolimax nana
Endolimax nana
A small, non-pathogenic amoeba found in the human intestine.
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Iodamoeba butschlii
Iodamoeba butschlii
A non-pathogenic amoeba found in the human intestine, characterized by a large glycogen vacuole in its cyst stage.
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Entamoeba histolytica Trophozoites
Entamoeba histolytica Trophozoites
The active, feeding stage of Entamoeba histolytica, characterized by its irregular shape and ability to ingest red blood cells.
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Transparent ectoplasm
Transparent ectoplasm
A clear outer layer of cytoplasm found in Entamoeba histolytica trophozoites.
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Granulated endoplasm
Granulated endoplasm
The inner, granular part of the cytoplasm in Entamoeba histolytica trophozoites, containing a small nucleus with evenly spaced chromatin dots.
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Entamoeba histolytica Cyst
Entamoeba histolytica Cyst
The dormant, infective stage of Entamoeba histolytica, characterized by a round shape, a thick outer wall, and the presence of 1-4 nuclei and chromatoid bars.
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Cigar shape chromatoid body
Cigar shape chromatoid body
Shapes within the cyst of E. histolytica that can look like cigars.
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Infective Stage
Infective Stage
The form of E. histolytica that is infective.
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Diagnostic Stage
Diagnostic Stage
The phase of E. histolytica visible in samples.
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Excystation
Excystation
Occurs after ingesting the Entamoeba histolytica cyst, the cyst wall weakens releasing trophozoites.
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Irregular shape
Irregular shape
The irregular shape of entamoeba histolytica.
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Ingested red blood cells
Ingested red blood cells
E. histolytica can consume red blood cells.
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Flask like ulcer
Flask like ulcer
Used to describe the flask shape of the ulcer caused by E. histolytica in the intestine.
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Entamoeba coli Trophozoites
Entamoeba coli Trophozoites
Irregular shape but more compact than Entamoeba histolytica, thin ectoplasm, granulate endoplasm, small nucleus with perinuclear chromatin dots irregular in size & spacing
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Entamoeba coli Cyst
Entamoeba coli Cyst
Characterized by, Large; nuclei 1,2,4 or 8; Chromatoid bars with pointed end.
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Endolimax nana Trophozoites
Endolimax nana Trophozoites
karyosome large, centric or eccentric, without peripheral chromatin.
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Endolimax nana Cyst
Endolimax nana Cyst
ovoid in shape; nuclei 1,2,or 4; karyosome large with little or no peripheral duration.
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Iodamoeba butschlii Trophozoites
Iodamoeba butschlii Trophozoites
nuclei with large central karyosome; karyosome surrounded by small chromatin granules
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Iodamoeba butschlii Cyst
Iodamoeba butschlii Cyst
large glycogen vacuole; nucleus as in trophozoites.
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- Intestinal Protozoa include Amoebae
- Amoebae are categorized into pathogenic and commensal types
Pathogenic Amoebae
- Entamoeba histolytica is a pathogenic amoeba
Commensal Amoebae
- Entamoeba coli, Endolimax nana, and Iodamoeba butschlii are examples of commensal amoebae
Entamoeba histolytica Trophozoites
- They have an irregular shape
- They feature transparent ectoplasm and granulated endoplasm
- The nucleus is small with perinuclear chromatin dots that are regular in size and spacing
- They are capable of ingesting red blood cells
Entamoeba histolytica Cysts
- Cysts are round in shape and have an outer cyst wall
- They contain 1, 2, or 4 nuclei
- Chromatin bars might be seen
- Flask-like ulcers in the infected intestine, caused by E. histolytica can be observed in sections of infected intestines
- Clusters of amebae may extend from the epithelium through the lamina propria and muscularis mucosa
- Some amebae may show their nuclei or ingested red blood cells
Entamoeba coli Trophozoites
- E. coli trophozoites are irregular in shape but more compact than E. histolytica
- The ectoplasm is thin with granulated endoplasm
- The small nucleus has perinuclear chromatin dots that have irregular size and spacing
Entamoeba coli Cysts
- E. coli cysts are large and contain 1, 2, 4, or 8 nuclei
- They possess chromatoid bars with pointed ends
Endolimax nana Trophozoites
- They have a large karyosome that can be centric or eccentric
- Peripheral chromatin is absent
Endolimax nana Cysts
- Cysts are ovoid in shape with 1, 2, or 4 nuclei
- They have a large karyosome with little to no peripheral chromatin
Iodamoeba butschlii Trophozoites
- Nuclei contain a large, often central karyosome
- The karyosome is surrounded by small chromatin granules
Iodamoeba butschlii Cysts
- Cysts feature a large glycogen vacuole
- Nucleus as in trophozoites
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