Chapter 33 -9 Flashcards

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1
Q

What are the characteristics of pinworms?

A

highly communicable
cause severe itching
passed with worm’s eggs

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2
Q

Where do pinworms live?

A

in lower colon & rectum

move to the anus to lay eggs

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3
Q

What causes trichinosis?

A

trichinella spiralis

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4
Q

How is trichinella spiralis contracted?

A

by eat encysted larvae in rare pork

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5
Q

What is happening in trichinella spiralis?

A

1) female burrows into intestine & release live offspring into the blood
2) Painful cysts form in muscle tissue.

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6
Q

What are heartworms?

A

microfilaria transmitted by mosquito bite

grows in the heart & slows blood flow

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7
Q

Elephantiasis is caused by?

A

filarial worm

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8
Q

What happens in elephantiasis?

A

tangled nests of worms infest vessels of lymphatic system causing fluid to pool w/in body & limbs to swell & stretch

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9
Q

What is ascaris?

A

when worms infest mammals
separate sexes
digestive/respiratory pathway

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10
Q

Which phylum are the ciliated wheel animals found in?

A

rotifera

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11
Q

What are the characteristics of rotifera?

A

pseudocoelomate
bilateral
live in ponds & lakes

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12
Q

What captures food in rotifera?

A

ciliated corona

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13
Q

What is the reproductive lifecycle like in rotifera?

A

dominant female
eggs produced through parthenogenesis
males produced in fall for winter eggs

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