Heart and Circulation Flow
Follow one drop of blood all the way around the double circulatory system.
Step 1 of 7
Deoxygenated blood returns to the heart
Blood that has given up its oxygen to the body tissues returns through the vena cava and enters the right atrium. Veins have thin walls, wide lumens and valves to stop backflow.
Goes in
- • Vena cava
Comes out
- • Right atrium