The cervix is the narrow doorway at the bottom of the uterus, or womb. Tall cells inside it make mucus that helps keep germs out.
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The uterus, or womb, is where a baby can grow. Its narrow bottom part is called the cervix. A small tunnel runs through the middle of it.
That tunnel is lined with one layer of tall, column-shaped cells. Their tops are packed with little drops of mucus, and their nucleus sits near the bottom.
These cells release their mucus into the tunnel. The mucus acts like a gooey gate.
When someone is pregnant, the mucus gets very thick and forms a plug in the cervix. It helps keep germs away from the growing baby.
Press Make mucus on the 3D model to see the cells fill the tunnel with mucus.