Bio Lab Chapter 9 - Phylum Platyhelminthes, Flatworm Flashcards
phylum Platyhelminthes is also called a
flatworm
phylum Platyhelminthes can grow anywhere between ____ to ____ in length
1mm to 20mm in length
phylum Platyhelminthes body is dorsal - ventrally __________ and it’s body is only a few _____ thick
depressed, mm thick
what symmetry does a phylum Platyhelminthes have
bilateral symmetry
phylum Platyhelminthes contain sensory structures in the ___________(anterior/posterior) portion of the body
anterior
define cephalization
the concentration of sense organs, nervous control, etc., at the anterior end of the body, forming a head and brain, both during evolution and in the course of an embryo’s development.
phylum Platyhelminthes have cephalization, or an advanced _________ ___________
nervous system
sensory structures in phylum Platyhelminthes are located in the __________ portion of the body
anterior (frotnt)
define triploblastic
having a body derived from three embryonic cell layers (ectoderm, mesoderm, and endoderm)
what are the cellular layers of phylum Platyhelminthes
- ectoderm
- mesoderm
- endoderm
define acoelomate
organisms that have no true body cavities between the layers of their tissues
phylum Platyhelminths gastrovascular cavity is incomplete because
it only has one opening
(for food to go both in and out)
phylum Platyhelminths contain a __________ system and lack ___________ and __________ systems
contain a muscular system
lack respiratory and circulatory systems
phylum Platyhelminths are mostly __________ and live inside the host
parasitic
(not all though!!)
phylum Platyhelminths are mostly monoecious, which means they
contain both male and female sex parts in the same organism
