This document discusses the speech organs and places of articulation involved in producing English consonants. It describes the vocal tract including the lungs, larynx, pharynx, oral cavity, and nasal cavity. It identifies the key articulators like the lips, teeth, alveolar ridge, hard palate, soft palate, tongue, and glottis. It also discusses consonant types based on airflow and manners of articulation. Diagrams illustrate the vocal tract anatomy and how different consonants are produced.