Chapter 13 Heart Model and Heart Dissection

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Tinker the heart.

Your heart is one of the more important muscles in your body. The heart starts beating when we are an embryo in our mother’s womb, only three weeks after the moment of fertilization between the sperm and egg. When it stops, you stop. In fact, that’s a key part of the definition of death: the old ticker is not pumping anymore.

The heart’s got an astonishingly intricate structure, and you can see it all clearly if you dissect the heart of our fellow mammal, the cow. You can check out other hearts, too, but the cow heart is nice because it’s so much bigger than ours, which makes ...

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