In my film I would like to do a through object transition which is a mix of camera and editing techniques.
This website has a list of tutorials on how to achieve this effect:
A similar style of transition is used with the iconic walk past as seen here:
from all of the examples I have seen here I think that the practical transition would be the best to try as it looks more effective for less effort when compared to CGI, I shall most likely attempt both and use the best in my final version meaning I shall make a fake floor and heart with chest cavity.
To make these I shall use paper mache and chicken wire as the wire will provide a good shape which when filled with paper and painted could look quite good. for a transition into a person the camera would simply have to go to the body then fade into the shot of the modeled interior which when combined with sound effects should work really well.