Video narration
How does blood reach every part of your body, then find its way back? Think of the heart as a pump station. Blood follows a repeating bus route, not a random journey. Blood returning from the body reaches the heart’s right side. It is oxygen-poor—not empty of oxygen—and carries extra carbon dioxide. The heart sends it to the lungs, where it releases carbon dioxide and picks up oxygen. Here’s the turn: the heart is not sending separate batches. It runs two connected loops, with the lungs between them. Oxygen-rich blood returns to the heart’s left side, then travels around the body, delivering oxygen. It carries carbon dioxide back to the heart. The bus analogy has a limit: blood is living tissue transport, not passengers. It reaches every part by going heart to lungs for oxygen, around the body, and back—one nonstop round trip.