Biological systems, simplified
Educational cutaways of living systems â the heart, the lungs, the kidneys and a leaf â drawn as clear, simplified models for learning, not for clinical use.
How the Human Heart's Four Chambers Work
One beat: two chambers receive, two pump, four valves keep blood one way.
How Gas Exchange in the Lung Alveoli Works
Air sacs and capillaries trade oxygen for carbon dioxide across a thin, wet wall.
How Kidney Nephron Filtration Works
Filter, reabsorb, then secretes: how one nephron turns filtered blood into urine.
How Gas Exchange Through Leaf Stomata Works
Microscopic pores open and close to trade carbon dioxide for oxygen and water vapour.