Blood enters the heart at the atria and then flows into the ventricles, which contract and push blood around the body. Valves in the heart keep the blood flowing in one direction.
CK-12 (Middle School)
How does your heart pump blood around the body?
RST.2 - Main Ideas, RST.4 - Key Terms
DEPTH OF KNOWLEDGE (DOK) LEVELS:
1,2Read this assignment in Actively Learn