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Cardiac Cycle

One heartbeat, step by step. The four boxes are the heart’s chambers. The short thick lines are its valves — one-way gates. Green dashed = gate open, blood can flow through. Solid dark = gate shut. Blue arrows show where the blood is moving. You’re facing the heart, so its right side sits on your left.

from the body from the lungs to lungs to body pulmonary valve aortic valve Right atriumLeft atrium Right ventricleLeft ventricle tricuspid valvemitral valve valve OPEN — blood flows through valve SHUT — no blood gets through dark red chamber = squeezing right now

Recall check

Study aid for intro A&P. Simplified model.