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BJU Life Science 12

Bob Jones Life Science - Chapter 12

invertebrate An animal that lacks a backbone.
filter feeder An organism that obtains food from water circulating through the its body.
radial symmetry A body pattern in which several different planes could divide an animal into equal halves.
nematocyst A stinging cell used by cnidarians for defense or for capturing food.
bilateral symmetry A type of symmetry in which there are two equal sides to an animal; only one plane can divide it into equal halves.
ganglion A mass of nerve tissue;sometimes called a simple brain.
stimulus Anything that causes a response in an organism.
closed circulatory system A type of circulation in which the blood remains in vessels.
aortic arches Organs that help to control blood pressure in earthworms.
water-vascular system A series of canals and tubules in echinoderms; used for movement and feeding.
exoskeleton An external skeleton composed of tough plates that protect and support certain animals.
compound eye An eye having many small lenses that provides a mosaic of images rather than a single image
open circulatory system The type of circulation in which the blood passes from blood vessels into body spaces around organs and tissues before returning to the heart.
tracheae One of the tiny tubes that branch throughout the body, carrying air to the tissues; in humans and vertebrate animals, the tube that carries air between the pharynx and the lungs
metamorphosis A changing of an animal's shape or form as the animal develops from an egg to an adult.
molting To shed scales, feathers, fur or an exoskeleton
incomplete metamorphosis Insect metamorphosis that includes three stages: egg, nymph, and adult.
nymph The immature stage of an insect with incomplete metamorphosis.
complete metamorphosis Insect metamorphosis that consists of four stages: eggs, larva, pupa, and adult.
larva An immature stage in the life cycle of many animals.
pupa A resting stage during the complete metamorphosis of certain insects.
Created by: heidio



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