Trachea annular ligaments of trachea. The epiglottis closes the opening to the larynx during swallowing. The trachea develops in the second month of development. It is lined with an epithelium that has goblet cells which produce protective mucins (see "Respiratory epithelium"). An inflammatory condition, also involving the larynx and bronchi, called croup can result in a barking cough. A tracheotomy is often performed for ventilation in surgical operations where needed. Intubation is also carried out for the same reason by the inserting of a tube into the trachea. From 2008, operations have experimentally transplanted a windpipe grown by stem cells, and
What More Can I Give money for charity, the intended purpose. WKTU-FM received numerous telephone calls and emails from listeners following their unauthorized playing of the song, thanking the station and asking where they could buy a copy of "What More Can I Give".<ref name="Michael Jackson's 9/11 Single Hits Radio One Year Late"></ref> "What More Can I Give" was eventually made available as a digital download on October 27, 2003. The websites whatmorecanigive.com and musicforgiving.com sold the song at a price of $2 per download, with a portion of the proceeds from the fee going towards children's charities such as Oneness, Mr. Holland's Opus Foundation