explain contraction and relaxation of vocal cords
Answers
Humans talk with the larynx, or voice box. This small but versatile apparatus is at the back of the throat, at the very top of the air passage called the trachea. It is both formed by, and is supported by, the cartilage rings of the upper airway. Inside it are the two vocal cords, which are the topmost parts of the vocal folds.
The folds are formed by thin bands of smooth muscle on opposite sides of the airway, covered by mucous membrane. They extend from the front to the back of the larynx, where they are attached to the arytenoid cartilages, which appear as a pair of bumps in its posterior wall.
Their contraction is controlled by a pair of nerves called the recurrent laryngeal nerves. They are spaced most widely during inhalation, but approach each other during voice production, and during swallowing. They appear as glistening white cord-like structures, arranged in a V. The opening to the airway below is through the vocal cords.
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