Normal heart anatomy; myocardial infarction heart demonstrating a partially healed, thinned, and discolored infracted area. Including a thrombus in the apex of the heart; and a heart demonstrating congestive heart failure as a result of hypertension. The left ventricle hypertrophy and the correspondingly enlarged and distorted shape of the heart is shown both internally and externally. All models are approximately 50% actual size.