Which of the following is NOT a function of the tongue?

The function of the tongue is multifaceted and plays a significant role in various oral activities. However, respiration is not one of the tongue's primary functions.

The tongue is crucial for speech, where it helps articulate sounds and form words by moving against the palate and teeth. It also plays a significant role in mastication, as it assists in manipulating food within the mouth to facilitate chewing and helps push food towards the pharynx for swallowing. Additionally, the tongue contributes to natural cleansing by helping to remove food debris and bacteria from the surfaces of the teeth and oral cavity, maintaining oral hygiene.

While the tongue is involved in various oral functions, respiration is predominantly a function of the respiratory system, such as the trachea, bronchi, and lungs. The tongue does not play a direct role in the process of breathing or the mechanics of respiration.