Speech is a physical process. Here’s a quick diagram of the organs that allow you to speak (and some of their yucky neighbors!):

Sketch of human vocal mechanism, including diaphragm, lungs, bronchi, larynx, vocal folds, resonators, and articulators.

(click to enlarge!)

For more on the biology of speech, check these CAH@DSU posts:

  1. Anatomy of a Speaker
  2. Vocal Health