题目内容
（请给出正确答案）
A、A-V node
B、A-V bundle
C、S-A node
D、Purkinje fibers
简答题官方参考答案
（由简答题聘请的专业题库老师提供的解答）
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更多“Which area allows the atria to completely empty as the ventricles fill with blood？”相关的问题
A、nanotechnology
B、nanocellulose
C、nanometers
D、nanoparticles
Mr. Zhang is an 83-year-old retired carpenter who still does “odd jobs” for friends and neighbors. His wife has pleaded with him to relax, but he ignores her. Despite having chest pains (angina) and periods of confusion, Mr. Zhang doesn’t trust doctors and has stubbornly refused to have a check-up. Recently, though, after several episodes of syncope (fainting) while he was hauling lumber, he grudging agreed to see a physician. On physical examination, the physician noted a murmur during systole (described as systolic ejection murmur), a palpable S4, and a significantly diminished aortic component of S2. His carotid artery pulse was weak, and had a delayed upstroke. The physician ordered a cardiac catheterization, which showed a pressure gradient of 100 mm Hg between the left ventricle and the aortic during systole, consistent with aortic stenosis. Question: 1.In aortic stenosis, there is significant narrowing of the aortic valve opening. Why does this narrowing cause a murmur? Why does this murmur occur during systole? What is the timing of the murmur with respect to S1 and S2? 2. What are the component of a normal S2, and why did Mr. Zhang have a diminished aortic (component) of S2?
A、Fast Na+ channel is in resting state
B、Fast Na+ channel is in open state
C、Slow Ca2+ channel is in resting state
D、Slow Ca2+ channel is in open state
A、Arteriole
B、Aorta
C、Capillaries
D、Venules
A、Increased length of filling time during diastole.
B、Increased end-diastolic volume.
C、Increased venous return.
D、Increased sympathetic stimulation of ventricular muscle.
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