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Chapter 6 Test

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Questions	Answers
What does it mean to take in oxygen and release carbon dioxide?	respiration
What does it mean to flow in a circular pattern?	circulate
In what system does blood have DIRECT contact with cells?	open circulatory system
In what system does blood stay in vessels at all times?	closed circulatory system
What is it called when an animal gets rid of substances or wastes that are not needed?	excrete
What is the chemical signal that glands produce?	hormone
What is the message that travels along nerve cells?	impulse