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.

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