Flashcards in Parasitology Deck (25)
A smaller organism that lives on or in and at the expense of a larger organism (host).
What is the phylum and class of "roundworms"?
What is the phylum and class of "tapeworms"?
What is the phylum and class of "flukes"?
*Free-living or parasitic?
*Ailmentary canal present?
*Separate sexes or hemaphroditic?
*Both free-living and parasitic
*Ailmentary canal present
*Alimentary canal present?
*Separate sexes or hermatphroditic?
*No alimentary canal
What is a scolex and who has one?
Scolex is the "holdfast organ" in cestodes. It's the head
What is a strobila and who has it?
Strobila is the body with proglottids found in cestodes
What is a proglottid and who has it?
Egg packets found in cestodes
*Separate sexes or hermaphroditic?
*Dorso-ventrally flattened - Leaf-like
Common name for diptera.
Common name for siphonaptera
Common name for Phthiraptera
What are the physical characteristics of insects?
Adults have 3 pairs of legs
3 body segments: head, thorax and abdomen
What are the physical characteristics of adult arachnids (acari)?
4 pairs of legs
2 body segments: cephalo-thorax and abdomen
No antennae, but palps
How many pairs of legs are found in nymph acari? Larvae acari?
4 pairs in nymphs
3 pairs in larvae
How are protozoa classified?
Classified based on their mode of locomotion.
What are the ways in which protozoa accomplish locomotion?
Define Definitive Host.
Harbors adult (sexual) stage of the parasite
Define Intermediate Host
Harbors larval (asexual) stage of the parasite
Define Incidental Host
An unusual host, unnecessary for the maintenance of the parasite in nature.
In what ways can parasites cause mechanical tissue damage?
Blockage of internal organs
Migration through tissues
Give examples of toxic parasite products
Toxic secretions (tick paralysis)
A type of acquired immunity in which the host is able to prevent superinfection by keeping parasite numbers in check without eliminating the infection (i.e. marlia, toxoplasmosis)