invertebrate Animal Flashcards
Invertebrates
an animal that does not have a backbone
Ganglion
a mass of nerve cells
Gut
the digestive tract
Coelom
a body cavity that contains the internal organs
Open circulatory system
a circulatory system in which the circulatory fluid is not contained entirely within vessels
Closed circulatory system
a circulatory system in which the heart circulates blood through a network of blood vessels that form a closed loop
Vertebrates
an animal of a large group distinguished by the possession of a backbone or spinal column, including mammals, birds, reptiles, amphibians, and fishes
consumer
A person or thing that eats or uses something
Bilateral symmetry
the property of being divisible into symmetrical halves on either side of a unique plane.
Asymmetry
lack of equality or equivalence between parts or aspects of something; lack of symmetry
sponges
have water intake and outlet openings connected by chambers lined with choanocytes, cells with whip-like flagella
Roundworms
a nematode, especially a parasitic one found in the intestines of mammals
Flatworms
a group of soft-bodied, usually much flattened invertebrates. A number of flatworm species are free-living
Exoskeleton
a rigid external covering for the body in some invertebrate animals
Mollusks
invertebrate animals such as snails, clams, or squids with a soft unsegmented body usually enclosed in a calcareous shell broadly : shellfish
