Week 3

Question 1

platyhelminthes characteristics

Answer 1

1 bilateral symmetry
2 triploblastic
3 have an excretory system with flame cells that aid in the removal of nitrogenous wastes
4 have a nervous system with sense organs
5 usually monecious
6 acolomate

Question 2

what is flame cells similar to?

Answer 2

our kidneys

Question 3

triploblastic

Answer 3

3 tissue layers

Question 4

what are the three layers of tribloplastic

Answer 4

endoderm
mesoderm
epiderm

Question 5

monoecious

Answer 5

hermaphodite

having both male and female reproductive organs in the same individual

Question 6

acoelomate

Answer 6

no true body cavity

Question 7

class turbellaria characteristics

Answer 7

1 free living

2 found in freshwater, usually under rocks or vegetation

Question 8

Dugesia common name

Answer 8

planaria

Question 9

Dugesia characteristics

Answer 9

triangular head with earlike auricles that house many sensory cells used for tactile and olfactory functions (not auditory)
presence of simple eyes called ocelli
locomotion performed in gliding pattern viia the glands in its cilliated epidermis
reproductive system- monoecious, can reproduce asexually

Question 10

do Dugesia have a complex reproductive system

Answer 10

yes

Question 11

who performs penis fencing and why

Answer 11

Dugesia

to decide who will carry the eggs

Question 12

how do planarians and other freshwater turbellarians reproduce asexually

Answer 12

transverse fission

Question 13

characteristics of Class Trematoda (Flukes)

Answer 13

endoparasitic
have at least 2 hosts
life cycle is linked closely to water

Question 14

endoparasitic

Answer 14

parasites that live inside the host’s body

Question 15

2 hosts of Class Trematoda

Answer 15

intermediate

definitive host

Question 16

intermediate host

Answer 16

invertebrate (usually snails)

Question 17

definitive host

Answer 17

vertebrate

Question 18

what is it important for Class Trematoda to be close to water

Answer 18

to have access to snails

Question 19

Fasciola hepatica (sheep liver fluke)

Answer 19

2 hosts
IH-snail
DH- herbivours vertebrate

Question 20

how is Fasciola hepatica spread to vertebrates

Answer 20

by eating vegetation with metacercariea on it

Question 21

how does the spread of Fasciola hepatica work

Answer 21

snail leaves metacercaria (like a cyst) on vegetation
eaten by DH, travels to liver were it grows and reporduces
eggs are released with the host’s feces
DH feces come in contact with water
miracidia leave feces and swim to snail

Question 22

local Trematodes

Answer 22

Schistosoma- infects birds, but furoocoercous cercariae can accidently penetrate human skin

Question 23

what does the accidental penetration of human skin by schistososoma cause

Answer 23

cercarial dermatitis,

parasite can’t survie in the human body, they will be killed by immune system fairly quickly but it will itch

Question 24

Class Cestoda (tapeworms) characteristics

Answer 24

endoparasites
life cycle is not directly linked to water
2 hosts
   IH- pigs, cows, rabbits (herbivores)
   DH- humans, dogs, wolves (carnivores)
body composed of 2 major sections

Question 25

2 major sections of the body of Class Cestoda

Answer 25

scolex | strobilla

Question 26

scolex

Answer 26

usually with hooks or lobes on rostellum used to connect to host's tissue

Question 27

strobilla

Answer 27

long chain of individual proglottids

Question 28

proglottid

Answer 28

one segment that contains its own reproductive and digestive organs

Question 29

where do proglottids develop

Answer 29

from the scolex and mature as they are pushed posteriorly

Question 30

how do Cestoda infect their next host

Answer 30

proglottids fall off and stick into the host's feces

Question 31

Taenia saginata (beef tapeworm)

Answer 31

most common in humans IH- cattle DH- humans rostellum with no hooks, mature prglottids with many branches

Question 32

Taenia solium (pork tapeworm)

Answer 32

IH- usually pigs, other vertebrates DH- humans rostellum with hooks, mature proglottid with no more than 13 branches

Question 33

pharnx

Answer 33

used for feeding, excreting, and mating

Question 34

ocelli

Answer 34

light sensitive pigment cup

Question 35

auricles

Answer 35

tactile (feeding and olfactory (smelling) structures

Question 36

diverticula

Answer 36

used like one giant, branching stomach that stretches throughout the organism. A

Question 37

is diverticula found in all three crossections

Answer 37

yes, fewer towards the posterior

Question 38

oral sucker

Answer 38

used for attachment to the host