Arterial flow
Venous return
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This simulation builds a stylized human body from six independent 3D layers — skin, muscle, skeleton, organs, circulatory system and nervous system — so each can be shown or hidden on its own, mirroring how a real anatomical atlas peels back transparencies to reveal what lies beneath. A dissection slider drives a GPU clipping plane through the skin and muscle from front to back, exposing the skeleton and internal organs without touching them, while a closed circulatory loop threaded through the heart, limbs and torso carries sixty instanced blood-cell particles that shift from arterial red to venous blue as they travel, timed to a heart that visibly pulses at a rate you control with the flow-speed slider.