Blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium. This is called the pulmonary circulation. The circulatory system of the blood is seen as having two components, a systemic circulation and a pulmonary circulation. While humans, as well as other vertebrates, have a closed cardiovascular system (meaning that the blood never leaves the network of arteries, veins and capillaries), some invertebrate groups have an open cardiovascular system.FMA: 7161.
Human fetal circulation differs from adult human circulation or even those of children in so many ways. This article outlines most of these differences. What are the reasons for the differences in fetal circulation and adult circulation? Fetal circulation differs from humans who are already born because of the difference in the circulatory system. Sep 14, 2019 · The red blood then returns to the fetus via the third vessel in the umbilical cord (umbilical vein). The red blood that enters the fetus passes through the fetal liver and enters the right side of the heart. The red blood goes through one of the two extra connections in the fetal heart that will close after the baby is born.
Aug 01, 2005 · The fetal circulation (Fig. 1) is markedly different from the adult circulation. In the fetus, gas exchange does not occur in the lungs but in the placenta. The placenta must therefore receive deoxygenated blood from the fetal systemic organs and return its oxygen rich venous drainage to the fetal systemic arterial circulation.Cited by: 30. So the blood vessels of the body carry blood in a circle: moving away from the heart in arteries, traveling to various parts of the body in capillaries, and going back to the heart in veins. The heart is the pump that makes this happen. * picture of the heart and its parts * picture of the body and some of its organs. The Circulation of Blood.