caption: the heart is cut open and filled with blood
exif: {"Image DocumentName": "1. atrial systole atria contract (blood is forced into ventricles)", "Image ImageDescription": "venrtricles relaxed. AV valves open, semilunar valves closed.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}