the biological function of the larynx (1)
(1) it opens to let you breathe
the biological function of the larynx (2)
(2) it closes to protect the airways (stop food going down the wrong way)
the biological function of the larynx (3)
(3) it closes to do thoracic fixation strenuous activity (pooing, coughing, weightlifting etc.)
secondary functions of the larynx
making sound and speech