Body — The Human

While the brain is the command center, the heart is the engine that keeps the machine running.

The heart beats about 100,000 times per day, pumping 2,000 gallons of blood through 60,000 miles of blood vessels—enough to circle the Earth twice. Blood delivers oxygen, nutrients, and immune cells while hauling away waste like carbon dioxide and lactic acid. The Human Body

Would you like this tailored for a specific medium (e.g., mobile app, textbook, museum kiosk, VR experience)? While the brain is the command center, the