What is the function of the vocal cords?

The function of the vocal cords is to produce sound as air passes through the larynx. The vocal cords, which are two bands of muscle tissue located in the larynx, vibrate when air is pushed from the lungs through them. This vibration creates sound waves, which are then shaped by the mouth, tongue, and lips to form speech.

The process begins when the vocal cords come together and air is expelled from the lungs, causing them to vibrate at different frequencies. The tension and length of the vocal cords can be adjusted, allowing for various pitches and tones. This ability makes the vocal cords crucial for spoken language and vocalization.

In contrast, the other options serve different functions in the respiratory system. Preventing food from entering the trachea is primarily the role of the epiglottis, which acts as a flap during swallowing. Filtering and humidifying air is achieved mainly by the nasal passages and associated structures. Regulating the breathing rate is a function of the respiratory centers in the brain, responding to various stimuli such as carbon dioxide levels in the blood.