Phylum Platyhelminthes Flashcards

You may prefer our related Brainscape-certified flashcards:
1
Q

bilateral symmetry

A

having two well-formed sides

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

scavengers

A

to feed off dead animals

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

hermaphrodites

A

having both male and female reproductive organs

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

flukes

A

class Trematoda

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Platyhelminthes

A

flatworm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

fission

A

reproduction by splitting in half

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

cephalization

A

having a head

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

pharynx

A

muscular tube for drawing in food near the mouth

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

proglottids

A

segment of tapeworms body

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

acoelomates

A

lacking a body cavity, without coelom, digestive cavity is lined with endoderm.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

class Cestoda

A

tapeworm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

diffusion

A

mechanisms for respiration, exception and circulation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

flatworm

A

soft bodied, few millimetres thick, have tissues and internal organs, three embryonic germ layers. bilateral symmetry.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

feeding

A

single opening for mouth and anus. near the mouth is a muscular tube called the pharynx, pharynx extends out of the mouth to pump into digestive cavity. digestion and absorption takes place in the gut. nutrients diffuse to other parts of the body.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

carnivores

A

preying on aquatic animals

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

parasitic worms

A

feed on blood, tissue fluids or pieces of cells. feed on already a digested food, simple digestive system.

17
Q

respiration, exception and circulation

A

rely on diffusion to transport oxygen and nutrients throughout. rely on diffusion to remove waste products and Co2, lacks gills or other respiratory organs. lack heart, blood vessels and blood. flames cells are found in flat worms. for excretion of excess water. they are joined in a. network of tubes that empties to outside environment through pores in skin.

18
Q

response

A

head encloses several ganglia which controls nervous system. has two longitudinal nerve cords along length of body connected by several shorter longitudinal Neve cords across the body. many flatworms have eyespots that detect changes in amount of light. also have specialized cells for detecting other external stimuli scattered throughout body located food and find dark hiding places.

19
Q

movement

A

movement via cilia on epidermal cells facilitating gliding through waters and over surfaces. muscle cells enable turning and twisting.

20
Q

reproduction

A

most free living flatworms are hermaphrodites meaning they have both male and female sex organs. during reproduction, two worms join to exchange sperm with one another. asexual reproduction occurs with fission, splitting in two. some species of worms “fall in pieces” with each smaller piece regenerating to become new individuals.

21
Q

group of flatworms, three groups include:

A

turbellarians, flukes and tapeworms.

22
Q

turbellarians

A

free-living flatworms, live in marine or freshwater, bottom dwellers in sand or mud under stones or shells. most familiar are planarians -> cross-eyed freshwater flatworm

23
Q

flukes

A

class Trematoda, parasitic flatworm found in any internal organs or blood of host. some are may be external parasites found on skin, mouth, gills or other outside body parts.

24
Q

tapeworms

A

class Cestoda, long, flat. parasitic worm found in intestines of host. digested food of host is absorbed directly into body of tapeworm.

25
Q

structure of a tapeworm

A

head has scolex which contains suckers or suckers for anchoring onto hosts intestinal walls. behind scolex is a narrow region that divides into proglottids segments of the tapeworms body. tapeworms can fertilize their own eggs or other individuals eggs.

26
Q

planaria

A

class turbelleria

27
Q

ganglia

A

collection of nerve cells

28
Q

cyst

A

dormant larval stage of tapeworm

29
Q

parasite

A

obtaining nutrients from a host