The purpose of the four valves of the heart is to ________.
A. control the rate of blood flow
B. keep the blood in the correct chamber
C. generate rhythmic contractions
D. maintain blood pressure
E. ensure one-way blood flow
Answer: E
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Indicate whether this statement is true or false.
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a. Physical b. Chemical c. Biological d. All of the above
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supercomputer mainframe microcomputer minicomputer