General ScienceCâu 74 / 120
Which organ system is responsible for pumping blood throughout the body?
a.Digestive system
b.Circulatory system
c.Nervous system
d.Respiratory system
Giải thích
The circulatory system, centered on the heart and blood vessels, pumps blood to deliver oxygen and nutrients. The respiratory system handles breathing, and the digestive system processes food.
Luyện miễn phí toàn bộ 120 câu hỏi — không cần đăng ký.
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