Atlas Obscura has published an interesting article about how Sound Designers tackle sounds inside the human body.
According to Hughes and Babcock, those decisions are mostly based on the infrastructural makeup of the body, and the idea that, as the camera zooms through this environment, it’s encountering different materials. “If there’s a bone, we’re going to hear cracking,” says Hughes. “If it’s something like an organ, it’s going to be coddled, given some movement.”
You can read the full article here.
There’s always the problem of how the audience will perceive a ‘new’ sound even if it is technically accurate.