Page 101 - Design in Nature

nasal cavity

palate

tongue

epiglotti

oesophagus

thyroid cartilage trachea

In order to facilitate speech, not only do the vocal cords, nose, lungs and air passages have
to work in harmony, but also the muscle systems that support these organs. Sounds created
during speech are produced by air passing through the vocal cords.

throat. These cords are like tiny curtains, which can be "drawn" by the action
of the small cartilages to which they are attached. Before speech, the vocal
cords are in an open position. During speech they are brought together and

caused to vibrate by the exhaled air passing through them. This determines
the pitch of an individual's voice: the tenser the cords, the higher the pitch.
The air is vocalised by passing through the cords and reaches to the
surface via the nose and mouth. The person's mouth and nose structure adds

personal properties unique to him. The tongue draws near to and away from
the palate and the lips take various shapes. Throughout these processes,