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a muscle, gland or organ capable of responding to a nerve impulse in order to bring about a reaction to stimuli.
extremely small infectious particles that can only reproduce inside a host cell.
a mixture of enzymes and other substances secreted by the exocrine cells of the pancreas.
organelles that only occur in the green parts of plants. They contain the green pigment...
a muscular structure on the floor of the mouth of most vertebrates, which manipulates food for ...