The pulmonary artery is a particular blood vessel that delivers deoxygenated blood (blood with less oxygen content) to the lungs, it pumps blood away from the heart in contrast to veins which deliver blood to the heart. The difference with respect to other arteries which carry oxygen-rich blood the pulmonary artery transports blood which has less oxygen.
The artery begins in the heart at the base of the right ventricle and at this point, it is known as the pulmonary trunk which is short and wide structure. The pulmonary trunk branches off in two directions which are the right and left pulmonary artery. The left pulmonary artery is short and it pierces through the sac around the heart which is the protective covering of the heart called pericardium. From there, the pulmonary artery enters the left lung. The right pulmonary artery is longer and travels across the upper chest of the human body and enters the right lung
The right and left pulmonary artery branches bring deoxygenated blood to the corresponding right and left lungs. There, the blood is enriched with oxygen and pumped back into the heart via the pulmonary veins. This oxygen-rich blood flows into the heart's left atrium and is then pumped to the left ventricle. Finally, it is dispersed through the aorta to the arteries which carries the oxygenated blood throughout our body. Normally blood pressure in the pulmonary artery is 18 to 25mm of Hg (systolic pressure at rest). The mean pulmonary pressure ranges from 12 to 16 mm of Hg.
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There are four pulmonary veins in the body which bring fresh oxygenated blood from the lungs to the left atrium. From the left atrium, the oxygenated blood travels to the left ventricle and from there it is pumped to various parts of the body.
The CO2 rich blood enters the capillaries where the CO2 is removed and O2 is obtained from the alveoli. From capillaries, blood enters bronchial veins and exit the lungs through the region known as the hilum, where both blood vessels and right and left main bronchi enter the lungs in the medial, central area of each lung.
After passing through the hilum, the right pulmonary vein passes posterior to the superior vena cava and right atrium to enter into the left atrium. The left pulmonary vein then passes in front of the descending aorta entering the left atrium.
Unlike other veins, pulmonary veins carry oxygenated blood from the lungs and back to the left atrium of the heart so it can be pumped to different parts of the body.
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The differences between pulmonary and systemic circulation are below:
The aorta is a major part of the systemic circulation and pumps blood to the entire body except for the respiratory area of the lung. It also regulates the blood flow and velocity within vessels. Aorta functions are:
Branches of ascending aorta supply blood to the heart.
Branches of the aortic arch supply blood to the head, neck and arms.
Branches from the thoracic descending aorta supply blood to the chest, excluding the heart and the respiratory zone of the lung.
Branches from the abdominal aorta supply blood to the abdomen.
The differences between pulmonary arteries and pulmonary veins are explalined below:
The difference between arteries and pulmonary arteries are below:
1. What is the function of the aorta in the heart?
A: The aorta is the primary and the largest artery of the human body that transports blood away from the heart to the rest of the body. After the blood is carried out from the heart through the aortic valve, it travels across the aorta, making a cane-shaped curve which connects with other major arteries to deliver oxygenated blood to the brain, muscles, and other cells. By doing this, the aorta takes part in the systemic blood circulation in the body.
The ascending aorta supplies blood to the heart.
The aortic heart supplies blood to the left side of the brain and neck and the left arm
The descending aorta supplies blood to oesophagus, pericardium, diaphragm, lump nodes, ribs and some structures of the heart.
The abdominal aorta carries blood to several parts of the body which includes
2. What is the primary function of the pulmonary artery?
A: The pulmonary arteries bring blood with less oxygen content to the lungs where the blood is enriched with oxygen and it is transported back into the heart with the help of the pulmonary veins. This oxygenated blood travels into the heart's left atrium and is then pumped to the left ventricle. Then it is circulated through the aorta to the arteries which carry it throughout all parts of the human body.