Understand How Your Body Works
Interactive Biology Visualizations
All 137 animations →The 32 our readers open most. Press play and watch a part of the body work — then break it on purpose and see what changes, with sound and live readouts in real clinical units.
Menstrual Cycle
Meiosis
Kidney Nephron
Chili & TRPV1
Lung Surfactant
Potassium & Heart
Mitochondria & ATP
Free Radicals
DNA → Protein
Magnesium & ATP
Protein Folding
Vitamin D
Autophagy & Fasting
Methylation Cycle
Sweat & Cooling
Thirst, ADH & Water
Caffeine & Adenosine
Nerve Impulse
Blood pH & Acid–Base
Cell Cycle & Cancer
Pain & the Gate
Red Cells & EPO
Vitamin B12
Na⁺/K⁺ Pump
Osmosis & Tonicity
Taste
Reflex Arc
Serotonin & Mood
Wound Healing
Hemoglobin & O₂
Lymphatic System
Growth Hormone
Browse the Health Library
Plain-language, referenced articles across every area of health — conditions, nutrition, and the lab tests that measure them.