Blood can flow from the atria down into the ventricles because there are openings in the walls that separate them. These openings are called valves because they open in one direction like trapdoors to let the blood pass through. Then they close, so the blood cannot flow backwards into the atria.
The atrium on the left side of the heart recieves oxygen-rich blood from the lungs and pumps it to the proper direction.The heart uses the four Valves to ensure the blood flows only in One Direction.
Answers & Comments
Answer:
Blood can flow from the atria down into the ventricles because there are openings in the walls that separate them. These openings are called valves because they open in one direction like trapdoors to let the blood pass through. Then they close, so the blood cannot flow backwards into the atria.
sa na makatulong po
Answer:
The atrium on the left side of the heart recieves oxygen-rich blood from the lungs and pumps it to the proper direction.The heart uses the four Valves to ensure the blood flows only in One Direction.