★ Human Circulatory System Quiz
What is the main function of the heart in the human circulatory system?
A. Regulating body temperature
B. Producing antibodies
C. Filtering waste from the blood
D. Transporting oxygen to the body
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Which blood vessels carry blood back to the heart?
A. Arteries
B. Veins
C. Capillaries
D. Venules
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