PHLUM NEMATODA Flashcards
worms undrr phylum nematoda
roundworms
are some of the most abundant animals on earth and range from microscopic to several meters long
roundworms
most parasites are ——- and they play an important role in recycling nutrients
free-living parasites
it is a parasite that is also free-living
roundworms
they are found in freshwater marine and soil habitats
roundworms/nematoda
are advanced over most flatworms by having a body cavity and organ and organ system level of organization
roundworms
it has a tube-within-a-tube body plan
roundworm
animal with a tube-within-a-tube body plan have a
complete digestive tract
a complete digestive tract has a digestiv tract with two opening which is
mouth and anus
all nematodes are —
round
all nematodes are —— because the body muscles contracting against the pseudocoelomic fluid generate an equal outward force in all directions
round
they do not crawl but move by thrashing their bodies using longitudinal muscles which only allow lateral movement
roundworms
are usually dioecious and reproduce sexually
nematodes
nematods in juvenile and adult stage —– periodically
molt
it encloses and protects the bodies of nematoda as they molt
cuticle
invertebrates that undergo molting are grouped in the ——- superphylum
ecdysozoa
superphylum of roundworms
ecdysozoa
elephantiasis of legs are due to
flarial worms
were historically transmitted to humans by eating undercooked pork
Trichinella
they show adaptations to their way of life such as cutucl resistant to their host digestive enzymes and behavior to increase transmission from one host to another
parasitic nematodes
as many as 800 million people worldwide may be infected with —-
Ascaris lumbricoides
they are found in the small intestine and produce large number of eggs that are excreted as feces
adut ascaris
when human ingest emrbryonated eggs they hatch as larvae in the
intestine
they penetrate the intestinal wall and are carried to the lungs via the blood circulation
larvae
