Invertebrate animals Flashcards
vertebrates
an animal that has a backbone
invertebrates
an animal that does not have a backbone
consumer
an organism that eats other organisms or organic matter
ganglion
a mass of nerve cells
gut
the digestive tract
coelom
a body cavity that contains the internal organs
bilateral symmetry
the two sides of its body mirror each other, it has equal right and left sides
radical symmetry
body is organized around the center like the spokes of a wheel
asymmetry
its body is not organized around a center
cnidaria
an aquatic invertebrate animal of the phylum Cnidaria which comprises the coelenterates
flatworms
a worm of a phylum which includes the planarians together together with a parasitic flukes and tapeworms and they have a simple flattened body
roundworms
they are a diverse animal phylum inhabiting a broad range of environments
mollusks
an invertebrate of a large phylum which includes snails, slugs, mussels, and octopuses and they live in aquatic or damp habitats
open circulatory system
blood is pumped by a heart into the body cavities where tissues are surrounded by the blood
closed circulatory system
they have the blood closed at all times within vessels of different size and wall thickness and in this type of system blood is pumped by a heart through vessels and does not normally fill body cavities
