Lungs, Air reservoirs that supply the airflow needed to produce speech sounds., Diaphragm, Primary muscle below the chest cavity that regulates airflow pressure and steady exhalation during speech., Larynx, Cartilaginous structure containing the vocal folds, which vibrate to produce voice., Tongue, Highly mobile muscle that changes shape and position within the mouth to shape vowels and consonants., Lips, External fleshy folds that close or approximate to form bilabial sounds (/p/, /b/, /m/)., Soft palate, Flexible back part of the palate acting as a valve to open or close airflow to the nasal cavity., Hard palate, Rigid bony roof of the mouth against which the tongue rests to articulate palatal sounds (/sh/, /ch/)., Teeth, Rigid structures that help articulate dental consonants (/t/, /d/)., Pharynx, Muscular tube connecting the oral and nasal cavities to the larynx; acts as a resonance chamber., Nasal cavity, Resonance space activated when the soft palate lowers, producing nasal sounds like /m/ and /n/.

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