Parasitology Flashcards
what is symbiosis?
the relationship between two organisms
what is mutalism?
a symbiosis in which both organisms benefit.
what is commensalism?
a symbiosis in which one individual gains without having beneficial or detrimental effects on its partner
what is parasitism?
a relationship between two organisms in which one derives benefit (i.e., parasite) from the other (i.e., host), usually to obtain nutrients or protection
what is a final/definitive host?
host that harbors the sexually matureadult forms
what is a intermediate host?
host(s) that harbor the larvae form or asexual stage of parasite
what is a reservoir host?
animals that harbor the same species of parasites as humans that are potential sources of human infection
what is a direct life cycle?
only one animal (human) host needed for the entire life cycle
what is an indirect life cycle?
more than one animal host required for complete life cycle
what are the different avenues for invasion of a parasite?
- digestive tract
- skin
- blood
what are platyhelminths?
aka flatworms
flat body covered with a plasma membrane
mainly hermaphrodites
what are the two types of flatworms?
- cestodes = tapeworms
2. trematodes = flukes
what are cestodes?
flatworms; specifically tapeworms
long, ribbon-like bodies (segmented)
scolex head with suckers, rostellum,and/or hooks
tegument(~skin) –> absorbs nutrients from host
NO body cavity
NO digestive tract
hermaphrodites
what are trematodes?
flatworms; specifically flukes
oval, leaf-shaped
unsegmented, flat body
ventral and oral suckers
asexual reproduction
blood flukes, lung flukes, liver flukes
what’s the common name for nemathelminths/nematodes?
aka roundworms!
ex. roundworms
ex. hookworms
ex. strongyles
ex. whipworms
ex. filariae
