🫀 Life Processes

Watch blood loop through your body in double circulation — and explore the 4 processes that keep you alive!

Oxygen-rich (red)Oxygen-poor (blue)

🧠 The Big Idea

Blood travels twice through the heart in one full round — once to the lungs, once to the body. That's double circulation.
Lungs turn blue (oxygen-poor) blood red (oxygen-rich); the body uses that oxygen and turns it blue again.
Nutrition, respiration, transportation & excretion together keep every cell fed, powered and clean.