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Emergency? Call 911.Emergency steps

Try “cardiac arrest”, “recovery”, “left ventricle”, or “hydration”.

    The Heart Lab

    Experiment with your heart science

    Five hands-on labs. Every number here is a simulated, educational illustration — not a personal measurement, diagnosis, or sports clearance.

    Lab 1

    Heartbeat Simulator

    Choose an activity level to see how an illustrative heart rate and a stylized ECG-style trace change.

    68BPM

    Illustrative value for “Rest”

    Rest

    Sitting calmly. Your muscles need relatively little oxygen, so your heart can beat slowly. Resting rates vary widely between healthy people.

    Simulated, illustrative values and a stylized trace — not your heart rate, not a diagnostic ECG, and not a target for anyone.

    Lab 2

    Blood Flow Explorer

    Follow oxygen-poor and oxygen-rich blood through the heart. Step through the tour, filter by blood type, or select any chamber or vessel.

    Moving dots show the direction of flow. Red = oxygen-rich, blue = oxygen-poor (real blood is always red).

    Step 1 of 9

    Body → heart

    Oxygen-poor

    Oxygen-poor blood returns from the body through the superior and inferior vena cava.

    Lab 3

    Exercise and Your Heart

    Pick a sport to explore its typical cardiovascular demands and the training adaptations it encourages.

    Lab 4

    Heart Rate Recovery Explorer

    Adjust the illustrative starting heart rate, exercise intensity, and recovery time. The simulated chart updates instantly.
    65bpm
    Exercise intensity
    5min
    End of exercise
    162
    Drop at 1 min
    44
    At end
    75

    All values are simulated beats per minute from a simple teaching model.

    What does recovery mean?

    When you stop exercising, your nervous system shifts back toward “rest and digest,” and heart rate falls — quickly at first, then more gradually. Harder efforts usually take longer to settle. Heat, hydration, sleep, illness, and fitness all affect recovery.

    This simulator can't assess you

    It cannot assess individual fitness, diagnose illness, or establish sports clearance. Real heart rates vary widely between healthy people. If you have symptoms such as chest pain, fainting, or a racing heart with dizziness, stop and get evaluated by a healthcare professional.

    Lab 5

    Myth vs. Fact

    Think you know the truth? Flip each card to find out.

    0 of 8 cards flipped