Interactive Circulatory Simulation
An Interactive Journey Through the Human Circulatory System. Discover how your heart pumps blood and keeps your body alive.
Click any part of the heart illustration below to inspect its anatomical name, flow direction, and biological function.
The right atrium is one of the four main chambers of the heart. It acts as a receiving holding tank for oxygen-poor blood coming back from the entire body.
Think of the Right Atrium like a waiting room for tired blood that needs to go to the lungs to get fresh oxygen!
The human heart is divided into four muscular compartments: two on the right side for oxygen-poor blood, and two on the left side for oxygen-rich blood.
Receives oxygen-poor blood returning from all parts of the body via the Vena Cava veins.
Pumps oxygen-poor blood out through the pulmonary artery directly to the lungs for refilling.
Receives fresh, oxygen-rich blood coming straight back from the lungs via pulmonary veins.
The strongest muscle chamber! Pumps oxygen-rich blood with high pressure into the Aorta to feed the entire body.
Watch red blood cells flow dynamically through the complete double-loop circulatory system. Track oxygen loading and delivery in real time!
Deoxygenated blood leaves organs and muscles after delivering oxygen, returning to the heart through the Vena Cava.
Valves act like strict check-valves or trapdoors that prevent blood from flowing backwards when the heart contracts.
Has 3 flaps (cusps). Opens to let oxygen-poor blood flow into the Right Ventricle, then snaps shut to stop backflow.
A semilunar valve that opens when the right ventricle squeezes, directing blood forward into the lung arteries.
Also called the Bicuspid valve (2 flaps). Opens to let fresh oxygenated blood fill the high-pressure left ventricle.
Opens under massive pressure as the left ventricle contracts, launching oxygenated blood into the systemic aorta.
Discover what happens inside microscopic lung sacs (alveoli) where carbon dioxide waste leaves the blood and fresh oxygen attaches to red blood cells.
Blue blood containing carbon dioxide waste arrives from the Right Ventricle.
CO₂ diffuses out of the blood capillaries into the air sac and is exhaled from your body.
Oxygen from inhaled air enters the blood and binds tightly to hemoglobin inside red blood cells.
Bright red blood travels back through Pulmonary Veins into the Left Atrium!
Your heart is an incredible, non-stop muscular pump powered by electrical signals that contract and relax muscle tissue over 100,000 times every day!
Answer these 8 questions to test your mastery of the heart chambers, valves, and circulatory pathways!