Chapter 26 Sponges and Cnidarians

27 terms by M_Kai 

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invertebrate

animals with no backbone

vertebrate

animals with a backbone

feedback inhibition

a mechanism of homeostasis where the body reacts to something in the external world (ex: getting hot and sweating)

blastula

hollow ball of cells

protostome

an animal whose mouth is formed from the blastopore

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

internal fertilization

fertilization in the inside of the body

larva

immature stage of an organism

gemmules

groups of archaeocytes surrounded by a tough layer of spicules

nematocyst

poison-filled sting structure that contains a tightly coiled dart

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

nerve net

a loosely organized network of nerve cells that together allow cnidarians to detect stimuli

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

external fertilization

fertilization on the outside of ones body

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