Blood Flow Unit 4 Essay

Blood Flow The Path blood takes through the body is a very interested one. In this essay you will heard about the path blood takes from the right femoral vein to lower lobe of the right lung via the pulmonary artery. If blood did not flow through the body we as humans could not function the way we currently do. Oxygenated blood is carried through the body by veins and arteries and this is what feeds the body so it can function (Thibodeau, Patton, 2008. ). Oxygenated blood is carried through the body by veins and arteries.

The path blood take from the right femoral vein to lower lobe of the right lung via the pulmonary artery is as follows; we start in the right femoral vein which is located in the thigh and travel to the right external iliac vein. Blood from the femoral vein emptiness in the inferior vena cava but first must travel through the external iliac. The iliac vein joins with the inferior vena cava. The inferior vena cava takes deoxygenated blood form the lower limbs of the body to the right atrium (Thibodeau, Patton, 2008. . Following the inferior vena cava we travel in to the right atrium of the heart. The purpose of right atrium of the heart is to receive deoxygenated blood from the body through the inferior vena cava and pump it into the right ventricle (MedicineNet. com, 2012). Once we are ready to leave the right atrium we go into the right AV valve (AV is atrioventricular or cuspid, (Thibodeau, Patton, 2008. ). The AV valve stops blood from flowing backwards and every time the heart beats the valve opens and closes.

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The AV valve allows blood to flow into the right ventricle. But before blood goes into the right ventricle it has to travel through the tricuspid valve. The tricuspid valve along with AV and SL are all structures that prevent blood from flowing backwards (Thibodeau, Patton, 2008. ). So we now know that the right ventricle receives deoxygenated blood from the right atrium, but what we don’t already know is that the right ventricle sends the blood to the lungs to be oxygenated.

So now back to our path, from the right ventricle we travel to the pulmonary SL valve, (SL is semilunar valve which has three cusps (Thibodeau, Patton, 2008). The SL valve lies between the right ventricle and the artery (Thibodeau, Patton, 2008. ). The SL valve prevents blood from going from the artery back in to the heart. If the SL valve didn’t stop blood from flowing backwards it could man problems. After traveling through the pulmonary SL valve we travel into the pulmonary artery.

We know that we have gotten into the pulmonary artery because the space becomes much smaller. The pulmonary artery carries the deoxygenated blood into the lungs for them to oxygenate and send back in to the body (Thibodeau, Patton, 2011. ). Now that we have traveled through the pulmonary artery we than travel in to the lung where blood becomes oxygenated and is than send back to in to the body for the process to start all over again. The pulmonary artery ends in the right lung, so we know that we are in the right place.

Throughout the whole process blood is traveling against gravity which as you know is extremely hard. The valves that are located in the veins stop the blood if it begins to travel backwards (Thibodeau, Patton, 2008). Now that we have reached the lung we need to travel down to the lower lobe of the right lung. We need to be sure that we are paying careful attention to where we are because in the right lung there are three lobes. In the left lung there are only two.

The three lobes located in the right lung are: the superior lobe, the middle lobe, and the inferior lobe. The superior lobe is located at the top of the lung. The middle lobe is located in the middle of the lung and the inferior lobe is located at the bottom of the lung. Now we know the path that blood takes from the right femoral vein to the lower lobe of the right lung via that pulmonary artery. The way blood travels is very interesting; it has to travel against gravity and has to travel in a spefic way in order not to cause us more harm than good.

Its reassuring to know that valves in the viens caught the blood as it is traveling against gravity and help it to continue on the correct path. It’s also important to know that the pulmonary SL value prevents blood from traveling backwards from the artery back in to the heart (Thibodeau, Patton, 2008. ). And think about how hard the heart has to work to keep blood pumping throughout our bodies 24 hours a day. Without our hearts pumping blood parts of the body may not function the way we know it to function now.