L1: Intro Flashcards
1
Q
most parasites exhibit site ________
A
specificity
2
Q
the _______ site of a parasite may change during its life cycle
A
predilection
ex: equine blood worm (Strongylus vulgaris) fourth stage larvae is in wall of cranial mesenteric artery; adult worms attach to mucosa of colon and rectum
3
Q
Ectoparasites _____ the skin, hair, feathers etc while Endoparasites _______ the internal organs and tissues
A
Ectoparasites infest
Endoparasites infect
4
Q
examples of parasite deterrents against host defenses
A
- acid and enzyme resistant eggs,cysts,larval stages
- avoid immune response via antigenic variation
- counter the immune response (immunomodulation)
5
Q
what adaptations do parasites have to ensure successful reproduction and transmission
A
High reproductive potential
* asexual repro
* hermaphroditism
* high output of eggs/cysts/etc
- environmentally resistant eggs/cysts
- host-seeking behavior
- altering host behavior
6
Q
parastie modes of transmission
A
- ingestion of eggs/cysts/larvae in food, water, etc
- direct contact b/w hosts
- transplacental ; transmammary
- penetration of skin or mucous membranes
- vector transmission
