Chapter 10 - Triploblastic, Acoelomate Body Plan The Flatworms (Phylum Platyhelminthes)

Characteristics
germ layers
1.
2.
3.
symmetry
(has a head)
Coelem =
Acoelomates = without a
Form and Function
Feeding
carnivores or scavengers; they have a
digestive cavity, mouth and pharynx
- feed on blood, tissues or pieces of cells from
within a HOST
Most do not have a complete digestive system because they absorb
material directly from host
Respiration, Circulation, and Excretion
1.
bodies allow for materials to diffuse
(respiration, excretion, etc)
2.
Cell - specialized cells that remove excess
water and wastes
Response
group of nerve cells that control the body (like a br
- group of cells that can detect light (like an eye)
Movement
Flatworms move in 2 ways
1.
help them glide through the water
cells help them twist and turn