Phylum Nematodes

Question 1

Nematoda aka

Answer 1

roundworms

Question 2

where do nematodes live

Answer 2

50%-ocean
25%-soil and freshwater
10%-on or in plants
15%-inside animals

Question 3

Nematodes are pseudocoelomate which means what

Answer 3

they have a false body cavity (coelom)

Question 4

mesodermal organs and gut reside in what

Answer 4

psuedocoel

Question 5

What is pseudocoelom derived from

Answer 5

blasocoel

Question 6

how does blastocoel become pseudocoel

Answer 6

splits down the middle

Question 7

how are nematodes simpler than platyhelminthes

Answer 7

longitudinal muscles- no circular
no osmoregulary cells are present

Question 8

Are nematodes dioecious or monoecious?

Answer 8

almost all are dioecious

Question 9

what type of sexual production does not occur in nematoeds

Answer 9

asexual

Question 10

How are nematodes more evolutionarily advanced due to psudocoelom

Answer 10

longitudinal muscles are more effective because now have a hydrostatic skeleton
space for organs
can circulate material internally
have a complete digestive tract

Question 11

what diffuses across the body wall of nematodes

Answer 11

ammonia

Question 12

respiratory system in nematodes

Answer 12

none. diffusion

Question 13

circulatory system in nematodes

Answer 13

none. simple movement in body cavity

Question 14

what are medically important parasitic nematodesd

Answer 14

Ascaris sp which are internal roundworms

Question 15

how many eggs can ascaris lay a day

Answer 15

200,000

Question 16

How long can juvenil ascaris remain viable on soil or plants

Answer 16

months or years
need shade moisture and oxygen

Question 17

Ascaris lifecycle in humans

Answer 17

eggs ingested> eggs hatch in digestive system>larva burrow through intestinal wall into veins or lymph vessels and are carried to the lungs> larva enter lung>larva coughed up and swallowed>mature in intestines and hang out

Question 18

T. canis and T. cati

Answer 18

Toxocara which is common worm for cats and dogs

Question 19

explain toxocara for prego mama with it

Answer 19

infect embryo in uterus thus puppies are born with worms

Question 20

What is visceral larva migrans (toxocara)

Answer 20

Toxocara cannot live in human so they wander in internal organs

Question 21

what nematode parasite is called American Killer

Answer 21

Necator americannus which is a hookworm

Question 22

Necator americaus causes what

Answer 22

anemia because it occurs as adults feed on blood after attaching to intestinal lining

Question 23

Necator life cycle

Answer 23

similar to ascaris (larvae pass from bloodstream to lungs to digestive system)
eggs hatch in moist soil and juvenile worms penetrate bare feet

Question 24

Trichinosis how is it similar to ascaris and different

Answer 24

similar- intestinal parasite as an adult
differ- bloodstream carried larvae to muscle instead of gut

Question 25

what is most common nematode parasite in human population of the US

Answer 25

pinworm

Question 26

Where do female pinworms go?

Answer 26

live in large intestine migrate to perianal region to lay eggs (BOOTY BUTT EGGS)

Question 27

Filarial Worms what does it cause and what is scientific name

Answer 27

Dirofilaria sp
heartworm in dogs

Question 28

How are filarial worms transmitted

Answer 28

mosquito

Question 29

What is drancunculus (guinea worm) and what is life cycle

Answer 29

nematode parasite
lives under skin of human host
shed larvae directly from an open sore into the water
infected by drinking contaminated water

Question 30

what is intermediate host for dracunculus

Answer 30

water flea (cyclops)

Question 31

Definitive host def

Answer 31

the adult sexually producing form of a parasite lives in

Question 32

Which nematode parasite has the simplest life cycle

Answer 32

pinworm

Question 33

which parasite req a mosquito to complete life cycle

Answer 33

dirofilarial