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Chapter 6 Test
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 |