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It forms the top part of the trachea to the front of the neck and  protected by gristly cartilage. When we breathe in through the nose or mouth, air travels through the larynx, down the windpipe, and then into the lungs.The larynx contains two bands of muscle called vocal cords. The cartilage at the front of the larynx is sometimes called the Adam's apple.While  speaking  the cords come together and vibrate as you breathe out. This gives the outcome of voice.

The larynx has three main parts:

1)The top part of the larynx is the supraglottis. 2) The glottis is in the middle. 3) The subglottis is at the bottom. The subglottis connects to the windpipe. The larynx plays important role in breathing, swallowing, and talking.The larynx can be consider as  a valve over the windpipe. The valve opens and closes to allow breathing.