The heart is a muscular organ that pumps blood. Blood that contains waste materials is brought to the heart by blood vessels. Th is blood enters the and then moves down. The presence of the prevents the backflow of blood inside the heart
2 answers:
Answer:
the tricuspid valve and the mitral valve
Answer:
I think you mean
The heart is a muscular organ that pumps blood. Blood that contains waste materials is brought to the heart by blood vessels. This blood enters the________and then moves down. The presence of the________prevents the backflow of blood inside the heart
Explanation:
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