Annotating these hearts - please help.. Watch
Also, for the first one, the straws are supposed to represent 'oxygenated' and 'deoxygenated' but I'm not sure if they are correct.
Can you attach pics as .jpg or .png files?
TSR are trying to save on bandwidth [understandable with the sheer volume of data], so have reduced max size of uploadable files and images - make sure your files are under 500KB - if a little over, right click file name, point to Send To and click Compressed Folder [first option], then try uploading again.
I have put in some work here for you - I don't know if it's wise to help a criminal AND one of the (few) degrees I don't have is vet science, so I might have got it wrong, but I think the pic on left is a posterior view and the one on left anterior view sectioned approx-ly sagitally [in a vertical plane front to back].