Human Body
How the body works, from cells to systems.
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Systems
Body Systems
The 11 systems that keep you alive â what each does, key organs, and how they connect.
Organs
Major Organs
Heart, brain, lungs, liver and more â what each organ does and why it matters.
Neuroscience
The Brain
Regions, functions, and the science of how your brain controls everything.
Structure
Bones & Muscles
The major bones and muscles â names, locations, and what they do.
Processes
How It Works
Step-by-step: digestion, immunity, blood clotting, and other key processes.