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Life Sci - Chap 15
Question | Answer |
---|---|
invertebrate | animal that does not have a backbone |
ganglion | mass of nerve cells |
gut | digestive tract |
coelem | body cavity that contains the internal organs |
open circulatory system | circulatory system where the circulatory fluid is not contained entirely within the vessels; heart pumps fluid through vessels that emprty into places called sinuses |
closed circulatory system | circulatory system where the heart circulates blood through a network of vessels that form a closed loop; blood doesn't leave the blood vessels; and materials diffuse across the walls of the vessels. |
segment | any part of a larger structure, such as the body of an organism, that is set off by natural or arbitrary boundaries |
exoskeleton | a hard, external support structure |
compound eye | eye composed of many light detectors |
antenna | feeler that is on the head of an invertebrate and that senses touch, taste or smell |
metamorphosis | phase in the life cycle of many animals during which a rapid change from the immature form of an organism to the adult form takes place |
endoskeleton | internal skeleton made of bone and cartilage |
water vascular system | system of canals filled with a watery fluid that circulates throughout the body of an echinoderm |