In the life cycle, what is released by regurgitation?

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Study for the Introduction to Parasitology Test. Use flashcards and multiple-choice questions, each question offers hints and explanations. Prepare for your exam thoroughly!

Multiple Choice

In the life cycle, what is released by regurgitation?

Explanation:
The infectious metacyclic promastigotes are what the sandfly transmits to the mammalian host during biting. During feeding, the parasite differentiates in the sandfly gut and the metacyclic promastigotes accumulate and are released by regurgitation into the bite wound. These slender, motile forms are adapted to survive in the host and are the ones that invade macrophages to establish infection. The other forms have different roles: amastigotes live inside host cells after infection, promastigotes exist in the insect vector but are not the specific transmitted form, and endospores are not part of this parasite’s life cycle.

The infectious metacyclic promastigotes are what the sandfly transmits to the mammalian host during biting. During feeding, the parasite differentiates in the sandfly gut and the metacyclic promastigotes accumulate and are released by regurgitation into the bite wound. These slender, motile forms are adapted to survive in the host and are the ones that invade macrophages to establish infection. The other forms have different roles: amastigotes live inside host cells after infection, promastigotes exist in the insect vector but are not the specific transmitted form, and endospores are not part of this parasite’s life cycle.

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