How is vocal pitch changed?
The CT muscle connects the two main cartilages that hold the vocal folds. When the CT Stretching Muscle contracts, the cartilages can rock and glide on top of each other resulting in the vocal folds lengthening, thinning, and stretching. The amount of stretch that occurs helps change the pitch being produced.
What is changing the pitch of your voice called?
So when your voice rises at the end of a question, that is technically called intonation. Inflection has two meanings: it can sometimes mean intonation, as Dictionary.com shows: modulation of the voice; change in pitch or tone of voice.