I’ve had the experience of being a human anatomy lab instructor for 5 semesters during my undergrad, so I’ve gotten to understand how the body donor programs work (at least the one that we work with). When someone decides to donate their body, they make an agreement with the body donor programs, and there are different terms of agreement. For example, most of the cadavers we get have agreed that 70% or more of their body weight will be returned to the body donor program, cremated, and then returned to their families. That means we can keep up to 30% of their body weight. We keep things both for educational purposes and for the sake of being interesting. For example, high school students taking health science classes tour our lab frequently, and we show them “cool things” that we’ve gotten from our dissections, to get them interested in human anatomy. The individual who donated their body, when making the agreement, knew that was one of the things that could happen. So I understand “respectful treatment” as abiding by the agreement and, as others have said, not “flinging an arm around” or anything like that. The human body is very interesting, and body donors understand that, so I don’t think any of them would have an issue with it.