Some of the tall cells on the inside surface of the womb have tiny hairs on top. The hairs wave back and forth.
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The uterus, or womb, is lined with a soft layer. Its very top surface is a single row of tall, column-shaped cells standing side by side.
Some of them have a crowd of tiny hairs on top called cilia. Others don't have cilia. They make fluid instead.
Cilia can beat many times every second, all moving together like a wave in a stadium!
The cilia wave back and forth. Scientists think this helps move a thin layer of fluid along the inside of the womb.
Moving fluid helps keep the surface clean and fresh, ready in case a baby starts to grow.
Press Wave the cilia on the 3D model and watch them sweep.