No artwork really does it justice, but we’ve put up so much about the heart here, I thought a diagram might be in order. Apologies to all you med students who already know this stuff.
The red blood, coming from the lungs, full of oxygen, goes through the heart and into the aorta for delivery throughout the body. The “blue” blood, which has already been depleted of oxygen by that trip around the body, goes from the right side of the heart, through the pulmonary artery and to the lungs for a fresh load of oxygen.
And here’s what a real one looks like. Generally speaking, each of our hearts is about the same size as our clenched fist.