| 单词 | atrioventricular |
| 例句 | The atria contract at the same time, forcing blood through the atrioventricular valves into the ventricles. Biology for AP Courses 2022-06-09T00:00:00Z Beginning with all chambers in diastole, blood flows passively from the veins into the atria and past the atrioventricular valves into the ventricles. Anatomy and Physiology 2013-06-19T00:00:00Z Effects of renal sympathetic denervation on heart rate and atrioventricular conduction in patients with resistant hypertension. American Heart Association Lists Top 10 Research Advances 2012-12-17T16:09:46Z Maisie was born at the hospital after a planned Caesarean section on 16 August 2011 with an atrioventricular septal defect, meaning the walls in her heart were missing. Baby killed by feeding overdose 2012-11-14T11:37:55Z It is the excitation of cardiac muscle cells at the atrioventricular node followed by the sinoatrial node. Biology for AP Courses 2022-06-09T00:00:00Z Electrical charges pulse from the SA node causing the two atria to contract in unison; then the pulse reaches the atrioventricular node between the right atrium and right ventricle. Biology for AP Courses 2022-06-09T00:00:00Z When the pressure falls below that of the atria, blood moves from the atria into the ventricles, opening the atrioventricular valves and marking one complete heart cycle. 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 Bundle branch blocks occur within either the left or right atrioventricular bundle branches. Anatomy and Physiology 2013-06-19T00:00:00Z Hemiblocks are partial and occur within one or more fascicles of the atrioventricular bundle branch. Anatomy and Physiology 2013-06-19T00:00:00Z Explain fully how the cardiac cycle would be affected if the signal was blocked at the atrioventricular node and why. Biology for AP Courses 2022-06-09T00:00:00Z The atrioventricular valves form between weeks five to eight. Anatomy and Physiology 2013-06-19T00:00:00Z The two atrioventricular valves, the tricuspid and mitral valves, are both open, so blood flows unimpeded from the atria and into the ventricles. Anatomy and Physiology 2013-06-19T00:00:00Z Partitioning of the atria and ventricles by the interatrial septum, interventricular septum, and atrioventricular septum is complete by the end of the fifth week, although the fetal blood shunts remain until birth or shortly after. Anatomy and Physiology 2013-06-19T00:00:00Z The atrioventricular valves form between weeks five and eight, and the semilunar valves form between weeks five and nine. Anatomy and Physiology 2013-06-19T00:00:00Z The atria would contract, but the ventricles would not, because the atrioventricular node passes signals to the Purkinje fibers, which allow the ventricles to contract. Biology for AP Courses 2022-06-09T00:00:00Z The coronary sinus is a large, thin-walled vein on the posterior surface of the heart lying within the atrioventricular sulcus and emptying directly into the right atrium. Anatomy and Physiology 2013-06-19T00:00:00Z Two of these openings are guarded by the atrioventricular valves, the right tricuspid valve and the left mitral valve, which prevent the backflow of blood. Anatomy and Physiology 2013-06-19T00:00:00Z Beginning with all chambers in diastole, blood flows passively from the veins into the atria and past the atrioventricular valves into the ventricles. Anatomy and Physiology 2013-06-19T00:00:00Z The septum between the atria and ventricles is known as the atrioventricular septum. Anatomy and Physiology 2013-06-19T00:00:00Z The ventricles would contract, but the atria would not, because the atrioventricular node passes the signal to the Purkinje fibers, which allow the ventricles to contract. Biology for AP Courses 2022-06-09T00:00:00Z The valves between the atria and ventricles are known generically as atrioventricular valves. Anatomy and Physiology 2013-06-19T00:00:00Z This impulse spreads from its initiation in the SA node throughout the atria through specialized internodal pathways, to the atrial myocardial contractile cells and the atrioventricular node. Anatomy and Physiology 2013-06-19T00:00:00Z The relative importance of this pathway has been debated since the impulse would reach the atrioventricular node simply following the cell-by-cell pathway through the contractile cells of the myocardium in the atria. Anatomy and Physiology 2013-06-19T00:00:00Z Regardless of the pathway, as the impulse reaches the atrioventricular septum, the connective tissue of the cardiac skeleton prevents the impulse from spreading into the myocardial cells in the ventricles except at the atrioventricular node. Anatomy and Physiology 2013-06-19T00:00:00Z The atria would contract, but the ventricles would not, because the atrioventricular node passes the signal to the Purkinje fibers, which allow the atria to contract. Biology for AP Courses 2022-06-09T00:00:00Z 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 Figure 19.19 illustrates the initiation of the impulse in the SA node that then spreads the impulse throughout the atria to the atrioventricular node. Anatomy and Physiology 2013-06-19T00:00:00Z They extend throughout the myocardium from the apex of the heart toward the atrioventricular septum and the base of the heart. Anatomy and Physiology 2013-06-19T00:00:00Z Between weeks five and eight, the atrioventricular valves form. Anatomy and Physiology 2013-06-19T00:00:00Z The ventricles would contract, but the atria would not, because the atrioventricular node passes the signal to the Purkinje fibers, which causes the atria to contract. Biology for AP Courses 2022-06-09T00:00:00Z Since these openings and valves structurally weaken the atrioventricular septum, the remaining tissue is heavily reinforced with dense connective tissue called the cardiac skeleton, or skeleton of the heart. Anatomy and Physiology 2013-06-19T00:00:00Z When the pressure falls below that of the atria, blood moves from the atria into the ventricles, opening the atrioventricular valves and marking one complete heart cycle. Anatomy and Physiology 2013-06-19T00:00:00Z How does the delay of the impulse at the atrioventricular node contribute to cardiac function? Anatomy and Physiology 2013-06-19T00:00:00Z |
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