University revision · Cellular Pathology

Urine Cytology

Question 1 of 100 Course: Biomedical Science(Degree)

What is the significance of finding 'signet-ring cells' in urine cytology?

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The trophozoite is the active, vegetative, and feeding stage in the life cycle of protozoan parasites. It is the form responsible for growth, metabolism, and reproduction within the host. Its primary biological functions are: 1) Feeding: It actively ingests nutrients from the host environment through mechanisms like phagocytosis (e.g., Entamoeba), absorption through the surface (e.g., Giardia), or a cytostome (e.g., Balantidium). 2) Locomotion: It moves to find favorable niches using structures like pseudopodia (amoebae), flagella (flagellates), or cilia (ciliates). 3) Growth and Asexual Reproduction: It grows in size and typically reproduces by binary fission (splitting into two), allowing for rapid multiplication and colonization within the host. 4) Pathogenesis: In pathogenic species, the trophozoite is the stage that causes tissue damage through invasion, toxin production, or competition for resources. The trophozoite is usually the stage associated with clinical symptoms of disease.

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