The first tentative touch - eeewww
Finding the aorta - the opening goes all the way to the bottom of the left ventricle.
Where do we cut?
Apparently, sixth graders are not trustworthy with scalpels, but they're allowed dull scissors to cut their hearts with.
The left ventricle, bicuspid (mitral) valve and the left atrium.
Those stringy-things? Yeah, those are your chordae tendonae - your heartstrings - so next time something tugs on your heartstrings, you know what they look like.
(Sorry, sometimes my science nerd comes out.)