Chap 26 Flashcards
The nervous system of cnidarians can be described as…?
A network of nerve fibres.
How many cell layers are there in cnidarians and sponges?
Two: ectoderm and endoderm.
Polyps are…?
Sessile. (Sponges, hydra, coral, and sea anenomes, and coral)
The medusa is the…?
(Motile) Saporophyte generation: cells with two times the amount of genetic material.
How many cell layers in flatworms?
3: Ectoderm, Mesoderm, Endoderm
In which embryonic layer does the coelom form?
Mesoderm.
Planaria (non-parasitic flatworm) start the digestion of food…?
Outside the body.
Flame cells…?
Regulate the water balance in planaria.
A group of nerve cells is referred to as…?
A ganglion.
The best way to avoid infestation by the trichina worm is not to:
Eat improperly cooked pork.
Which unsegmented worm lack a digestive system and digestive organs?
Tapeworm.
