26-27 Bio Vocab

Created by furby14 

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29 terms

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

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