Sunday, February 11, 2024

Entamoeba histolytica cyst is appear in which part of gastrointestinal tract.. Large intestine

Entamoeba histolytica cyst is appear in which part of gastrointestinal tract:

  • A- Stomach
  • B- Small intestine
  • C- Large intestine
  • D- Non of the above.

The correct answer is C- Large intestine.

Here's why:

- Entamoeba histolytica:

This is a single-celled parasite that causes the intestinal infection amoebiasis.

- Cyst:

This is the dormant stage of the parasite, allowing it to survive outside the human body and be transmitted through contaminated water or food.

- Life cycle:

When ingested, the cysts travel through the stomach and small intestine without hatching. Once they reach the large intestine (colon), the cysts mature into the active trophozoite stage, which can replicate and damage the intestinal lining. This can lead to symptoms like diarrhea, abdominal pain, and blood in the stool.

Therefore, while the cysts pass through the entire gastrointestinal tract, they only become active and cause infection in the large intestine.


Here's a summary of the parasite's journey:
  • Cyst ingestion: Enters the mouth with contaminated food or water.
  • Stomach: Passes through unharmed due to the acidic environment.
  • Small intestine: Doesn't hatch and continues without causing harm.
  • Large intestine: Matures into active trophozoites, causing infection and symptoms.
So, C- Large intestine is the accurate answer for where Entamoeba histolytica cysts appear.