1.   Each dot is made of many tiny tubes - much too small to see without a microscope.

2.   The lungs are in fact constructed of thousands of tiny tubes.

3.   Among the most popular are stents, the tiny metal tubes that prop open clogged blood vessels.

4.   Arterial Vascular makes tiny flexible tubes called stents that are inserted to prop open clogged arteries.

5.   As it digs, the mole extrudes a tiny tube containing two passageways that provide a link to the surface and back.

6.   A tiny tube takes periodic blood samples.

7.   Countless worms inside tiny tubes, though dead on arrival at the surface, clung to the chimney surfaces like a fringe.

8.   In the mantle, tiny tubes excrete the almost invisible specks of mineral salt that cement to the conchiolin.

9.   Now, he said, blood is drawn from all patients using the tiny tubes once used only for babies.

10.   Researchers stuck a tiny tube in the kidneys to allow them to pump out the waste.