the fetal pig dissection. 1) which vessel would be under higher pressure and why
ID: 265468 • Letter: T
Question
the fetal pig dissection.
1) which vessel would be under higher pressure and why?
2)the respiratory system-- notice that there are differing numbers of lobes on the right and left lungs. why would this be the case?
3)why is the pulmonary circuit bypassed in the fetus?
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Explanation / Answer
Q1) which vessel would be under higher pressure and why?
Inferior vena cavae is under high pressure.because in the fetus, the ductus venosus closes a portion of the left umbilical vein so blood flow directly to the inferior vena cava. allowing oxygenated blood from the placenta to bypass the liver.
Q2) )the respiratory system-- notice that there are differing numbers of lobes on the right and left lungs. why would this be the case?
Respiratory system notices different number of lobes in right and left lungs , in fetal pig the number of lobes in right lung are 4 , and in left lung they are 3 , the difference is due to presence of heart in left side , as lungs needs space during respiration, and heart also needs space for pumping , so the number of lobes are less in left side, helping in the space management between lungs and heart,so that they can simultaneously work .
Q3)why is the pulmonary circuit bypassed in the fetus?
In Fetus blood doesn’t get oxygenated in the lungs, it gets oxygenated in the placenta. The umbilical arteries carry blood from the fetus to the placenta. The umbilical vein carries blood from the placenta back to the fetus. So highly oxygenated blood in the fetus is found in the umbilical vein. Blood from the umbilical vein gets mixed with the systemic circulation and returns to the right atrium. The blood entering the right atrium is the most oxygenated blood in the fetal heart, fetus has a ductus arteriosus which short-circuits this blood flow, and allows some blood to go directly into the aorta and then into the systemic circulation.so as the blood get oxygenated in Placenta the pulmonary circuit is bypassed in fetus.
Pathway of blood in adult pig heart starting from anterior and posterior venacavae:-
Anterior and posterior vena cavae -------------> Right atrium------------> Rt.atrioventricular valve---------> Ventricle filled with blood and contracts ----------> AV valve closes preventing back flow of blood-------------> Pulmonary semilunar valve----------->Pulmonary artery---------> Lungs-------> Pulmonary vein--------> Return of blood to Lt.atrium--------> Left atrio-ventricular valve---------> left ventricle--------->prevents flow of blood when ventricle contracts----->Through aortic semilunar valve ---------> Aorta (Largest blood vessel)---------->smaller arteries --------> Body parts.
Explanation:-
Blood comes body to heart by Ant. and Post. Vena-cavae to the right atrium which is a receiving chambers of the heart. It is thin walled, small as compared to the ventricle. The right ventricle is present under the right atrium. This ventricle is large, thick walled .
Blood flows from the right atrium into the right ventricle by the right AV valve. When the ventricle fills with blood it contracts and then the AV valve closes preventing backflow of blood into the atrium. When backflow is prevented, the blood is forced to move by the pulmonary semilunar valve into the pulmonary artery. The pulmonary artery carries blood deficient in oxygen and rich in carbon dioxide to the lungs. This blood vessel divides once to reach each lungs. When blood passes through the lungs carbon dioxide is released and fresh supply of oxygen enters the blood and combines with haemoglobin. In the lung smaller blood vessels recombine to form a large pulmonary vein which returns the blood to the left atrium. This is the only vein in the body which transports blood rich in oxygen. The left atrium collects blood coming from both lungs. It is thin walled and small as compared to a ventricle. After filling, the atrium contracts forcing blood by the open left AV valve and into the left ventricle. The left AV valve, prevents backflow of blood when the ventricle contracts. The left ventricle is the largest and most muscular heart chamber. When it contracts blood is forced under very high pressure goes out by the aortic semilunar valve and into the aorta. This blood vessel is the largest of all of the arteries, it branches into a network of smaller arteries transporting blood to all parts of the body.
Blood comes body to heart by Ant. and Post. Vena-cavae to the right atrium which is a receiving chambers of the heart. It is thin walled, small as compared to the ventricle. The right ventricle is present under the right atrium. This ventricle is large, thick walled .
Blood flows from the right atrium into the right ventricle by the right AV valve. When the ventricle fills with blood it contracts and then the AV valve closes preventing backflow of blood into the atrium. When backflow is prevented, the blood is forced to move by the pulmonary semilunar valve into the pulmonary artery. The pulmonary artery carries blood deficient in oxygen and rich in carbon dioxide to the lungs. This blood vessel divides once to reach each lungs. When blood passes through the lungs carbon dioxide is released and fresh supply of oxygen enters the blood and combines with haemoglobin. In the lung smaller blood vessels recombine to form a large pulmonary vein which returns the blood to the left atrium. This is the only vein in the body which transports blood rich in oxygen. The left atrium collects blood coming from both lungs. It is thin walled and small as compared to a ventricle. After filling, the atrium contracts forcing blood by the open left AV valve and into the left ventricle. The left AV valve, prevents backflow of blood when the ventricle contracts. The left ventricle is the largest and most muscular heart chamber. When it contracts blood is forced under very high pressure goes out by the aortic semilunar valve and into the aorta. This blood vessel is the largest of all of the arteries, it branches into a network of smaller arteries transporting blood to all parts of the body.
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