Studying for my test

I have a test on chapters 8 & 9 (Cardiovascular and Lymphatic systems). I'm reading over the section talking about the heart.

"The two atria are separated by the interatrial septum. In the fetus, the two atria communicate with each other through an oval opening, the foramen ovale, shunting the blood from the right to left because the lungs do not function and the placenta takes the place of lungs. This opening closes at birth when the baby takes its first breath and remains as an oval depression (fossa ovalis)." (Emphasis mine.)

Ok, so it makes perfect sense to do it that way. If the lungs aren't working yet, it is useless to send blood there to be oxygenated. But it makes sense to me, a thinking, intelligent being. Considering that this whole entire course has been focused on the chemical reactions that cause cells and parts of cells (that are non-intelligent) to do things that cause muscle contraction, blood clotting, hormone release, and phagocytosis (immune system cells "eating" foreign bodies), I don't think the developing human body does anything "because the lungs do not function." Using those terms implies that the developing heart has some sort of plan or thought process or intelligence behind its actions, rather than a response to a chemical that the pituitary or hypothalamus has released. I'm willing to accept that there's an intelligence behind the wonders of the human body. But I highly doubt the authors of my textbook are willing to accept it.

Oh well.