They constitute, in human body, with
the buccalresonator, and the nasalresonator,oneof
the three places of sound resonance.
At the exit of the buccal canal, if the lipsare projected forward and rounded,the third resonator is formed:the labialresonator.
By roundingthe lips forward and raising the bottom of the tongue towards the posterior part of the palate we produce
the soundو (Wa), which corresponds to
the english sound /u/ like in the word "true".
By gluing the lips, one creates an occlusion zone which produces the soundب
(Ba), which corresponds to the enblish /b/ like in the word "Brother".
By stickingthe lips and accompanied by the "the nose sound" or "nasalization", one obtains the sound م (Miim), which corresponds to the sound /m/ like in the word "mother"in english,
but with a longer and morereinforced
Finally,with the end of the upper incisorson the inside of
the lower lip, the sound ف(Fa) is produced, which corresponds to the sound /f/ like in the word "father"in english.