Not medical advice. The Journal of Biohacking reports published research and teaching models. Nothing on this page is medical advice, a diagnosis, or a recommendation to use any compound, product, or therapy. Where a dose appears, it is a figure reported in a cited study or by its sponsor, not an instruction. Editorial position on dosing.
Drag to orbit the chest in 3D, then take a guided ride: dive through the heart chambers, ride the airway down to a single alveolus, or follow a red blood cell on the full loop from heart to lungs and back. Change the heart rate and breathing rate and the whole system, the 3D motion, the ECG trace, the blood flow, re-syncs live.
A stylized educational model built procedurally for the Journal of Biohacking. Proportions and motion are simplified to teach the system, not to serve as a medical reference. Educational content only, not medical advice. The 3D view uses Three.js, MIT licensed.
Peel the system open without leaving the page.
The lungs move air, the heart moves blood, and neither works alone. Every breath loads oxygen into the blood at the alveoli, and every heartbeat sends that blood out to the body and brings the used blood back. Tap a structure below, or anywhere in the list of parts, to inspect it up close.
The heart beats about five times for every breath at rest. Use the Sync Lab below to break that ratio and watch the system strain or settle.
Resting heart rate and breathing rate are trainable numbers. The Sync Lab presets show what changes between rest, hard effort, and slow breathwork.
Ten structures, each one a stop on the loop. Selecting a part moves the camera, lights up the model, and loads its story in the panel beside the stage.
One red blood cell makes this entire trip in about a minute at rest. Each step below jumps the camera to that leg of the journey.
Heart rate and breathing rate drive everything on this page: the 3D beat, the lung swell, the valve flaps, the speed of the blood cells, and both traces. Try slow breathwork after hard effort and watch the ECG settle.
The Journal of Biohacking angle. Baseline medicine keeps this system from failing. Training pushes its capacity up, and the same numbers in the Sync Lab are the scoreboard.
Long, easy aerobic work, the pace where you can still speak in short sentences, is the classic stimulus for more mitochondria and a larger stroke volume. The heart literally ejects more blood per beat, so resting heart rate drifts down over months.
In the model: load the Hard effort preset, then imagine the same workload at 15 beats lower. That gap is the adaptation.
Breathing near 5 to 6 breaths per minute syncs with the baroreflex, the blood pressure control loop, and heart rate swings grow larger with each breath. It is the fastest voluntary lever most people have on their own nervous system.
In the model: hit Slow breathwork and watch the breath trace stretch while the ECG spacing breathes with it.
VO2 max is simply the most oxygen this heart and lung loop can deliver per minute. It is one of the strongest known predictors of long term health, and it is trainable at almost any age with a mix of easy volume and hard intervals.
In the model: cardiac output in the Sync Lab is the delivery half of that number. Raise fitness and the ceiling rises with it.