Trachea are generally highly elastic but they may calcify with age. The trachealis muscle connects the ends of the incomplete rings and contracts during coughing, reducing the size of the lumen of the trachea to increase the rate of air flow. The esophagus lies posteriorly to the trachea, adjoining along the tracheoesophageal stripe. Circular horizontal bands of fibrous tissue called the annular ligaments of trachea join the tracheal rings together. The cartilaginous rings are incomplete to allow the trachea to collapse slightly so that food can pass down the esophagus. A flap-like epiglottis closes the opening to the larynx during swallowing
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