Chapter 9: Trematoda General Characteristics

Question 1

Helminth Meaning

Answer 1

Worm

Question 2

Platyhelminthes

Answer 2

Closely associated with Mollusca
Cestode (tapeworms)
Trematodes (Flukes)

Question 3

Nematoda

Answer 3

Closely related to Arthropods

Nematodes (roundworms)

Question 4

Platyhelminthes

Answer 4

Bilateral symmetry
Flattened dorsoventrally
Cephalization
ladder-type nervous system
acoelomates
digestive canal present
No specialized circulatory of respiratory strucutres

Question 5

Trematodes Primarily affect

Answer 5

Intestines, lungs, liver and bladder

Question 6

Trematodes basic description

Answer 6

Unsegmented, leaf-like bodies
Oral and ventral suckers
Intestinal system has blind ending
Ladder-type nervous system
No blood circulation
Most are hermaphrodites

Question 7

Cercariae

Answer 7

larval stage that escapes from mollusk

Question 8

Metacercaria

Answer 8

When cercariae encysts on vegetation

Question 9

Trematode infection

Answer 9

Occurs from ingestion of insufficiently cooked fish, crustaceans, and vegetation

Question 10

Acetabulum

Answer 10

Ventral sucker: holdfast organ not associated with feeding

Question 11

Nephridial

Answer 11

Excretory pore

Question 12

Glycocalyx

Answer 12

outer surface coat with enzymatic protective activities, Overlies the plasma membrane

Question 13

Surface Invaginations

Answer 13

Uptake and transport of amino acids and sugars

Question 14

Actin spines

Answer 14

help the worms to anchor themselves

Question 15

Miracidium

Answer 15

A ciliated, non-feeding life stage

Question 16

Sporocyst

Answer 16

sack in which the next stage redia develops

Question 17

Praziquantel (biltricide)

Answer 17

causes muscle paralysis due to calcium dysregulation in the tegument

Question 18

Triclabendazole

Answer 18

Prevents the polymerization of tubulin into the cytoskeletal structures and microtubules