| 单词 | pulmonary trunk |
| 例句 | The fetal circulation therefore bypasses the lungs by shifting some of the blood through the foramen ovale, a shunt that directly connects the right and left atria and avoids the pulmonary trunk altogether. Anatomy and Physiology 2013-06-19T00:00:00Z To prevent confusion between these vessels, it is important to refer to the vessel exiting the heart as the pulmonary trunk, rather than also calling it a pulmonary artery. Anatomy and Physiology 2013-06-19T00:00:00Z Figure 20.23 Pulmonary Circuit Blood exiting from the right ventricle flows into the pulmonary trunk, which bifurcates into the two pulmonary arteries. Anatomy and Physiology 2013-06-19T00:00:00Z There is no single better word to describe the function of the heart other than “pump,” since its contraction develops the pressure that ejects blood into the major vessels: the aorta and pulmonary trunk. Anatomy and Physiology 2013-06-19T00:00:00Z The great veins, the superior and inferior venae cavae, and the great arteries, the aorta and pulmonary trunk, are attached to the superior surface of the heart, called the base. Anatomy and Physiology 2013-06-19T00:00:00Z Most of the rest of the blood is pumped to the right ventricle, and from there, into the pulmonary trunk, which splits into pulmonary arteries. Anatomy and Physiology 2013-06-19T00:00:00Z The right ventricle pumps deoxygenated blood into the pulmonary trunk, which leads toward the lungs and bifurcates into the left and right pulmonary arteries. Anatomy and Physiology 2013-06-19T00:00:00Z In this figure, the atrioventricular septum has been removed to better show the bicupid and tricuspid valves; the interatrial septum is not visible, since its location is covered by the aorta and pulmonary trunk. Anatomy and Physiology 2013-06-19T00:00:00Z The presence of the pulmonary trunk and aorta covers the interatrial septum, and the atrioventricular septum is cut away to show the atrioventricular valves. Anatomy and Physiology 2013-06-19T00:00:00Z This allows the blood to be pumped out of the ventricles and into the aorta and pulmonary trunk. Anatomy and Physiology 2013-06-19T00:00:00Z When ventricular pressure rises above the pressure in the two major arteries, blood pushes open the two semilunar valves and moves into the pulmonary trunk and aorta in the ventricular ejection phase. Anatomy and Physiology 2013-06-19T00:00:00Z The two semilunar valves, the pulmonary and aortic valves, are closed, preventing backflow of blood into the right and left ventricles from the pulmonary trunk on the right and the aorta on the left. Anatomy and Physiology 2013-06-19T00:00:00Z The pulmonary valve is located at the base of the pulmonary trunk, and the left semilunar valve is located at the base of the aorta. Anatomy and Physiology 2013-06-19T00:00:00Z As pressure in the ventricles rises above two major arteries, blood pushes open the two semilunar valves and moves into the pulmonary trunk and aorta in the ventricular ejection phase. Anatomy and Physiology 2013-06-19T00:00:00Z It is marked by the presence of four openings that allow blood to move from the atria into the ventricles and from the ventricles into the pulmonary trunk and aorta. Anatomy and Physiology 2013-06-19T00:00:00Z The pulmonary artery is an artery that arises from the pulmonary trunk and carries deoxygenated, arterial blood to the alveoli. Anatomy and Physiology 2013-06-19T00:00:00Z The valves at the openings that lead to the pulmonary trunk and aorta are known generically as semilunar valves. Anatomy and Physiology 2013-06-19T00:00:00Z It includes four rings that surround the openings between the atria and ventricles, and the openings to the pulmonary trunk and aorta, and serve as the point of attachment for the heart valves. Anatomy and Physiology 2013-06-19T00:00:00Z The single vessel exiting the right ventricle is the pulmonary trunk. Anatomy and Physiology 2013-06-19T00:00:00Z The ductus arteriosus is a short, muscular vessel that connects the pulmonary trunk to the aorta. Anatomy and Physiology 2013-06-19T00:00:00Z The pulmonary trunk arteries and their branches are the only arteries in the post-natal body that carry relatively deoxygenated blood. Anatomy and Physiology 2013-06-19T00:00:00Z Most of the blood pumped from the right ventricle into the pulmonary trunk is thereby diverted into the aorta. Anatomy and Physiology 2013-06-19T00:00:00Z The ductus arteriosus is a temporary vessel, connecting the aorta to the pulmonary trunk. Anatomy and Physiology 2013-06-19T00:00:00Z During ventricular systole, pressure rises in the ventricles, pumping blood into the pulmonary trunk from the right ventricle and into the aorta from the left ventricle. Anatomy and Physiology 2013-06-19T00:00:00Z The right ventricle pumps oxygen-depleted blood into the pulmonary trunk and right and left pulmonary arteries, which carry it to the right and left lungs for gas exchange. Anatomy and Physiology 2013-06-19T00:00:00Z At the base of the pulmonary trunk is the pulmonary semilunar valve, which prevents backflow of blood into the right ventricle during ventricular diastole. Anatomy and Physiology 2013-06-19T00:00:00Z Failure of the ductus arteriosus to close results in blood flowing from the higher pressure aorta into the lower pressure pulmonary trunk. Anatomy and Physiology 2013-06-19T00:00:00Z |
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