right lung left lung to systemic circulation from body
hover any structure for its name · physiology at rest

❤️ Cardiac monitor

Heart rate72 bpm
Phase—
Cycle length— s
Stroke volume70 mL
Ejection fraction≈58%
Cardiac output— L/min
EDV / ESV120 / 50 mL
SpO₂ right / left≈75% / ≈98%

ECG — lead II

PR 0.16 s · QRS 0.08 s · QT ≈ 0.36 s (rate-scaled)

Wiggers — pressures & LV volume

LV — · Ao — · LA —
LV volume —

Structure

Hover the heart…
Every chamber, valve, vessel, septum, coronary artery and conduction element is a hover target — tooltip follows the cursor.

Heart

40–180 bpm · mild respiratory sinus arrhythmia included

Overlays

Legend

deoxygenated oxygenated
Blue is a diagram convention — real deoxygenated blood is dark red (SpO₂ ≈ 75%).

Valve timing: AV valves (tricuspid, mitral) close → S1 “lub”; semilunar valves (aortic, pulmonary) close → S2 “dub”. AV valves flow only during diastole, semilunar valves only during ejection; coronary arteries perfuse mainly in diastole.

Resting reference: LV 120/5–8 mmHg · RV 25/5 · LA 8–10 · RA 2–6 · aorta 120/80 · LV wall 8–12 mm · RV wall 3–5 mm · SV ≈ 70 mL · EF ≈ 58%.