5.6 Helminths

Question 1

Length of helminths?

Answer 1

1mm to 25um

Question 2

Two main groups of helminths

Answer 2

flatworms (platyhelminthes) and roundworms/nematodes (aschelminthes)

Question 3

structure of flatworms

Answer 3

segmented body plan of proglottids

Question 4

roundworm (nematode) structure

Answer 4

unsegmented, long

Question 5

flatworms break down into what two groups

Answer 5

cestodes/tapeworms and trematodes/flukes

Question 6

Are helminths unicellular or multicellular?

Answer 6

Multicellular

Question 7

How do helminths obtain their food

Answer 7

hetertrophic

Question 8

Organ structure of helminths? (4)

Answer 8

Mostly developed reproductive organs (cestodes have this); high reproductive potential; cuticles for protection; mouth glands

Question 9

Three morphological cycles

Answer 9

embryo, larval, and adult

Question 10

Helminths reproduce….

Answer 10

sexually inside of a hosts body

Question 11

Sexes of nematodes

Answer 11

different sexes

Question 12

Sexes of trematodes

Answer 12

hermaphroditic

Question 13

sexes of cestodes

Answer 13

hermaphroditic

Question 14

Describe the life cycle of helminths

Answer 14

transmit infective form; larvae develop in intermediate host; adulthood are spent in the definitive host; then exits the host for the cycle to be complete

Question 15

How does transmission occur with helminths

Answer 15

Oral ingestion is most common, also penetration, though

Question 16

About how many helminths case diseases in humans

Answer 16

around 50