Active Form of Entamoeba histolytica
Entamoeba histolytica is a protozoan parasite known for causing amoebiasis, particularly in the intestines of humans. Its active form is called the trophozoite, which plays a critical role in its feeding and pathogenicity.

Feeding Mechanism
- The trophozoite primarily feeds on the following:
- Intestinal Mucosa: It invades the epithelial cells of the intestine, leading to tissue destruction and ulceration.
- Bacteria: The trophozoite consumes various bacteria found in the gut, utilizing them as a nutrient source.
- Red Blood Cells: In severe cases, it may ingest red blood cells, contributing to the symptoms of dysentery.

Environment and Habitats
- The trophozoite thrives in:
- Warm, Moist Conditions: Its optimal growth environment is within the human intestine, where it can absorb nutrients effectively.
- Low Oxygen Levels: E. histolytica prefers anaerobic conditions, which are prevalent in the colon.

Pathogenicity and Impact
- The feeding behavior of the trophozoite leads to:
- Intestinal Damage: The destruction of the intestinal lining results in symptoms such as diarrhea, abdominal pain, and dysentery.
- Potential Systemic Effects: In severe cases, the parasite can spread to other organs, causing complications like liver abscesses.
In summary, the active form of Entamoeba histolytica, the trophozoite, feeds on intestinal mucosa, bacteria, and red blood cells, thriving in anaerobic conditions within the human gastrointestinal tract. Its feeding behavior is directly linked to the pathogenicity and clinical manifestations of amoebiasis.

Entamoeba histolytica feeds upon cells of colon