Biology · Module 16

Human Physiology Visuals

Animated heart with cardiac cycle, ECG waveform, neural action potentials, and breathing mechanics — living anatomy.

Heart Rate

Heart Rate (BPM) 72

Stroke Volume 70 mL

Cardiac Output = —

Systole: Contraction (ventricular)

Diastole: Relaxation (filling)

SA Node → AV Node → Bundle of His

Cardiac Cycle

The heart beats ~100,000 times per day. Each cycle: Atria fill (diastole) → SA node fires → Atria contract → AV node delays → Ventricles contract (systole) → Blood pumped to lungs & body.

Breathing Parameters

Breathing Rate (per min) 15

Tidal Volume 500 mL

Minute Ventilation = —

Total Lung Cap ≈ 6000 mL

Residual Volume ≈ 1200 mL

Inspiration: diaphragm ↓, lungs expand

Expiration: diaphragm ↑, elastic recoil

Human Physiology Visuals

Cardiac Cycle

All-or-Nothing Law