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23 terms

Chapter 34: Flatworms, roundworms, and rotifers.

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Pharynx
Muscular tube where food is ingested.
Flame cell
Enclose tufts of beating cilia that resemble flickering candle flames.
Cerebral ganglion
Two clusters of nerve cells at the anterior end serving as a simple brain.
Eyespot
Cup-shaped; locatede near the cerebral ganglia, used to sense intensity and direction of light.
Fluke
Leaf-shaped flatworms that parasitize many kinds of animals, including humans.
Tegument
External surface of a fluke.
Primary host
The host from which the adult parasite gets its nourishment and in which sexual reproduction.
Intermediate host
Host from which the larvae derive their nourishment.
Schistosomiasis
Resulting disease causes by schistosome eggs which is fatal.
Scolex
Knob-shaped organ at the anterior end of tapeworm.
Proglottid
Long series of body sections.
Cyst
Dormant larvae surrounded by protective coverings.
Roundworm
Worms with long, slender bodies that taper at both ends.
Cuticle
Protective, noncellular layer.
Hookworm
Group of intestinal parasites.
Trichinosis
Disease which causes muscle pain and stiffness.
Pinworm
Most common roundworm parasite of humans in the United States.
Filarial worm
Disease-causing roundworms that infect over 250 million people in the tropical countries.
Elephantiasis
Where limbs become extremely swollen and skin hardens and thickens.
Rotifer
Transparent, free-living animals that live in fresh water, although some live in salt water and damp soil.
Mastax
Muscular organ that breaks the food into smaller particles.
Cloaca
Common chamber into which the digestive, reproductive, and excretory systems empty.
Parthenogensis
Unfertilized eggs develop into adult females.