Chapter 33 -9

Question 1

What are the characteristics of pinworms?

Answer 1

highly communicable
cause severe itching
passed with worm’s eggs

Question 2

Where do pinworms live?

Answer 2

in lower colon & rectum

move to the anus to lay eggs

Question 3

What causes trichinosis?

Answer 3

trichinella spiralis

Question 4

How is trichinella spiralis contracted?

Answer 4

by eat encysted larvae in rare pork

Question 5

What is happening in trichinella spiralis?

Answer 5

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

Question 6

What are heartworms?

Answer 6

microfilaria transmitted by mosquito bite

grows in the heart & slows blood flow

Question 7

Elephantiasis is caused by?

Answer 7

filarial worm

Question 8

What happens in elephantiasis?

Answer 8

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

Question 9

What is ascaris?

Answer 9

when worms infest mammals
separate sexes
digestive/respiratory pathway

Question 10

Which phylum are the ciliated wheel animals found in?

Answer 10

rotifera

Question 11

What are the characteristics of rotifera?

Answer 11

pseudocoelomate
bilateral
live in ponds & lakes

Question 12

What captures food in rotifera?

Answer 12

ciliated corona

Question 13

What is the reproductive lifecycle like in rotifera?

Answer 13

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