Topics: Human Body Quiz
What are the three main parts of the circulatory system?
A. Blood, Heart, and Lungs
B. Blood, Blood Vessels, and Heart
C. Smooth muscles, Lungs, and Bones
D. Blood Vessels, Muscles, and Air Sacs
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Your heart, blood vessels, red blood cells and white blood cells make up your….
A. Nervous system
B. Respiratory system
C. Circulatory system
D. Immune system