We're going to discuss the way that blood moves inside the developing circulatory system of the fetus. So let's begin inside the placenta. Inside the placenta. And so we have an exchange taking place. Oxygen and nutrients are picked up by the blood of that fetus, while carbon dioxide and other waste products are deposited into the blood of that mother. And once this exchange takes place inside the placenta, a special type of blood vessel carries the oxygenated and nutrient filled blood away from the placenta and towards the heart of that developing fetus.