phylum platyhelminthes

Question 1

bilaterian animals- symmetry? germ layer devolopment?

Answer 1

bilateral symmetry
triploblastic dev

Question 2

coelom?

Answer 2

acoelomates

Question 3

muscular system

Answer 3

circular and longitudinal muscle fibres

Question 4

digestive system

Answer 4

primitive - blind intestine - one opening

Question 5

reproductive sytem

Answer 5

hermaphrodites

Question 6

what regulates osmotic balance?

Answer 6

protonephridia
flame cell attached
cilia inside flame cell
water moves in and out of nephridiopores

Question 7

outer body covering

Answer 7

• ciliated epidermis contains rhabdites
  -no ciliated epidermis = syncytial epithelium

Question 8

what are rhabdites

Answer 8

structures on ciliated epidermis that when released into the water expand and form mucous coat around animal for protection

Question 9

what is the syncitial epithelium

Answer 9

non ciliated tegument / outer covering

Question 10

respiratory / circulatory system?

Answer 10

neither - flat shape = cells are close to the surrounding water = diffusion

Question 11

4 classes of phylum platyhelminthes

Answer 11

turbellaria
monogena
cestoda
trematoda

Question 12

class turbellaria

Answer 12

flatworm

Question 13

class monogena

Answer 13

external parasites of fish

Question 14

class trematoda

Answer 14

flukes

Question 15

class cestoda

Answer 15

tapeworms

Question 16

primary host

Answer 16

parasite sexually reproduces and eggs are released here
AKA definitive host

Question 17

intermediate host

Answer 17

where larval stage develop and asexual reproduction