Phonetics is the study of speech sounds and has four main branches: articulatory, combinatorial, acoustic, and auditory phonetics. The document discusses the organs of speech which produce speech sounds, including the lungs, larynx, pharynx, and nasal cavity. It also examines the articulators in the oral cavity, categorizing the tongue, palate, teeth and lips as active articulators and the hard palate, soft palate, and uvula as passive articulators.

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4. THE ARTICULATORS OF THE ORAL CAVITY The articulators are situated in or surrounding the oral cavity, they are the tongue, palate, teeth and lips. ACTIVE ARTICULATORS PASSIVE ARTICULATORS LIPS TONGUE TEETH HARD PALATE SOFT PALATE UVULA