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a type of symmetry in which there are two equal sides to an animal; only one possible plane will divide it into equal halves
one of many small blood vessels that have walls that are one cell thick; materials are exchanged between the blood and other body tissues in the capillaries
a type of symmetry in which several different planes could divide an animal into equal halves
a structure capable of receiving a stimulus from the environment and sending an impluse along a neuron
a structure in animals and humans which provides mechanical support for muscle attachment and maintaining body shape
in animals a blood vessel that carries blood toward the heart; in plants, the vascular tissues in leaf blades
phylum that are roundworms; examples - roundworm (ascaris), hookworms, pinworms, trichina worms
phylum that are segmented worms; examples - earthworm, leeches, tubeworms, scale worms, clam worms, and lugworms
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