Helminths Flashcards
what worm is in the phylum platyhelminthes
flatworms
what worm is in the phylum nematode
roundworms
what 2 classes are associated with flatworms
trematodes (flukes)
cestoda (tapeworms)
explain the hygiene hypothesis
parasites play an important role in regulating the host immune response
what may occur in the absence of parasites in the body
promote allergies, inflammatory and autoimmune diseases
true or false:
nematodes (roundworms) are the most abundant animals on earth
true
true or false:
majority of important helminth pathogens are nematodes
true
what is the body structure of a nematode
pseudocoelomate
what are the 2 groups of flatworms
cestodes (tapeworms)
trematodes (fluke)
how many hosts are involved with tapeworms
at least 2
what are some of the parts associated with the structure of cestodes
scolex (anchor)
proglittids
strobila
in what worm, is the first host always a snail
flatworms (trematodes)
how many hosts are required for all species of flatworms
at least 2
what is the general structure of trematodes
acoelomate
2 suckers
incomplete digestive
what are ways for helminths to invade host tissue
ingestion
direct penetration
wound infection / penetration
