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29 terms

26-27 Bio Vocab

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deuterostome
animal whose anus is formed from the blastospore
anus
opening through which waste leaves the digestive tract
endoderm
inermost germ layer
mesoderm
middle germ layer
ectoderm
outermost germ layer
radial symmetry
symmetry going around in a circle across the body
bilateral symmetry
symmetry that can split into two identical parts
caphalization
concentration of sense organs and nerve organs at the front end of the body
choanocytes
specilized cells that use flagella to move a steady current of water through the sponge
spicule
spike-like structure made of chalklike calcium carbonate or glasslike silica
archaeocytes
specialized cells that move around within the walls of the spong
gemmules
groups of archaeocytes surrounded by a tough layer of spicules
cnidocytes
stinging cells located along tentacles in which cnidarians get their name
polyp
a cylindrical body with armlike tentacles; mouth points upwards, routed to ground
medusa
motile, bell-shaped body with a mouth on the bottom
gastrovascular cavity
digestive chamber with one opeing
hydrostatic skeleton
consists of a layer of circular muscles and a layer of longitudinal muscles that (along with the nerve net) enable the body to move
acoelomate
A solid-bodied animal lacking a cavity between the gut and outer body wall
coelom
A body cavity completely lined with mesoderm
pharynx
An area in the vertebrate throat where air and food passages cross; in flatworms, the muscular tube that protrudes from the ventral side of the worm and ends in the mouth
flame cell
Specialized cell that filters and remove excess water from the body of a flat worm
ganglion
A cluster (functional group) of nerve cell bodies in a centralized nervous system
eyespot
Group of cells that can detect changes in amount of light in the enviroment
hermaphrodite
An individual that functions as both male and female in sexual reproduction by producing both sperm and eggs
fission
Form of asexual reproduction in which an organism split into two, and each half grows new parts to become a complete organism
scolex
Head of an adult tape worm
proglottid
One of the segments that nake up most of a tape worm's body
osculum
large hole at the top of the sponge through which water leaves the sponge
nematocyst
stinging structure within each cnidocyte of a cnidarian used to poison or kill prey