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Mariulka [41]
3 years ago
12

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
Biology
2 answers:
ale4655 [162]3 years ago
4 0

Answer:

the tricuspid valve and the mitral valve

Natali5045456 [20]3 years ago
4 0

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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