Beneath the honeybee's hard exoskeleton sits an insect body plan very different from a vertebrate's: a nerve cord that runs along the belly instead of the back, a single pulsing tube of a heart with no arteries or veins, and a network of air-filled tubes that carries oxygen directly to every tissue without ever touching blood. This model makes the cuticle translucent so all four systems can be seen working at once, in roughly correct position and scale.
A resting honeybee's heart beats around 60–100 times a minute, but during flight it can exceed 200 beats per minute — while its tracheal air sacs expand and contract with every wingbeat to keep the enormous flight muscles supplied with oxygen.
A translucent 3D honeybee model with its exoskeleton faded away to reveal the digestive tract, tracheal breathing tubes, dorsal-vessel heart and ventral nerve cord all working together inside.
The insect body plan beneath the cuticle: an open circulatory system with a single pulsing heart tube, tracheal tubes that deliver oxygen directly to tissues, and a ladder-like ventral nerve cord instead of a spinal cord.
Fade the cuticle with the transparency slider, switch activity level to speed up the heartbeat and ventilation, and toggle each internal system on or off to study it in isolation. Drag to rotate, scroll to zoom.
A honeybee's heart rate can jump from around 90 beats per minute at rest to well over 200 during flight, while abdominal pumping drives air through the tracheal system to keep the flight muscles oxygenated.