Select your answer:
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Cardiovascular System › ViewWhat is the purpose of the valves in the heart?
A. To prevent pathogens from entering the heart
B. To control how fast the heart beats
C. To keep the blood flowing in only one direction
D. To separate the heart into two sides
Human Body › View
This system removes waste products from the body that can cause toxic build up and lead to diseases or death
A. nervous
B. respiratory
C. circulatory
D. excretory