| 11. | Then, the strand zips through a narrow tube.
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| 12. | Construction of a narrow tube lined with mucosa ( a urethra ) is a similar challenge.
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| 13. | When the narrow tube opened up, we were once again standing upright in a large chamber.
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| 14. | Radiologist Graham Lee uses narrow tubes called catheters to inject a clot-buster called urokinase directly into clots.
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| 15. | The new form also consists of narrow tubes, but the tubes are connected in a willowy lattice.
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| 16. | This gave a more vertical arrangement of the water-tubes, thus encouraging thermosyphon circulation in these narrow tubes.
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| 17. | A narrow tube will sound " reedy ", while a wide one will sound " flutey ".
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| 18. | The narrow tube is then removed.
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| 19. | A long, narrow tube called a catheter is inserted through a plastic hollow tube called an introducer sheath.
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| 20. | Catheters are narrow tubes that doctors snake through the circulatory system to approach blockages from inside a blood vessel.
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