Four chambers move blood through the circuit. The right atrium receives blood from the body, and the right ventricle sends it to the lungs. Blood returns to the left atrium, then the left ventricle pumps it outward. Artery and vein describe direction relative to the heart, not oxygen content.
The human body · Discover & try
Where does blood travel next?
Reading level 3 of 5 · IndependentChange
Word help
Artery
A vessel carrying blood away from the heart.
Vein
A vessel returning blood to the heart.
Valve
A structure that helps prevent backward flow.
Watch · Try · Explain
See how it works
The interactive activity is loading.
Flat route diagram, not an anatomical view. Colours label oxygen level; all blood is red. Playback follows one representative packet, not a real heartbeat.
What to look for
- Follow a complete loop.
- Compare vessel direction with oxygen colour.
Explain what you noticed
A vessel carries blood from the heart toward a kidney. Which name fits its direction?
Keep this idea: Direction defines an artery or a vein; the two heart–lung–body loops work together.
Follow the sources
Source material checked 2026-10-28. Explanations and activities by Nepedia. Source links do not imply endorsement.
Keep following the idea
Next discovery →