The Solid Color Heart Shape

The heart is the metaphor that describes this diagram. The heart represents what is central to teaching.

The heart also is a metaphor indicating that there is movement from

• The upper left ventricle to the upper right ventricle
• The upper left ventricle to the bottom ventricle
• The upper right ventricle to the bottom ventricle
• The upper right ventricle to the upper left ventricle
• The bottom ventricle to the upper right ventricle
• The bottom ventricle to the upper left ventricle

If arrows were drawn they would be two headed because they indicate both directions from each of the ventricles.