Understanding the Sounds of Farts: What Causes the Noises?

Fart noises come from two mechanisms:

  1. Anal sphincter vibration: The circular muscle relaxes as gas passes; its vibration against gas creates sound. Pitch depends on sphincter tightness and gas volume.
  2. Anal canal resonance: The curved muscular tube acts as a resonance chamber, amplifying the sound into characteristic "honk" or "toot."

Combined, these produce the familiar fart noise.

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