38. Which of the following patterns of oxygen saturation most likely represents those obtained from normal fetus (1 representing the highest saturation and 4 representing the lowest saturation)? A) Umbilical Vein 1 1 4 4 4 Inferior Vena Cava at the Diaphragm 2 2 3 2 1 Superior Vena Cava 3 4 2 3 3 Left Atrium 4 3 1 1 2
The circulatory system comprises of the heart and the blood vessels. Most of the animals including humans are aerobic organisms and therefore require oxygen as it is the terminal electron acceptor during cellular oxidation process during which energy in the form of ATP in synthesized. The heart along with the blood vessels are responsible for delivering oxygen to all parts of the body through blood. It is also responsible for removing the carbon dioxide that is obtained as a by-product of cellular oxidation.
The human fetus that develops inside the mother of humans are dependent on the mother for nutrients and oxygen. This is made possible by an organ called placenta that develops inside the uterus of the mother during pregnancy and in addition to supplying nutrients and oxygen it is also responsible for removing the waste products from the fetal blood.
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