Question
Refer to Focus Figure 18.2, specifically the pressure in the left atrium. Which statement best explains the second rise in atrial pressure on the line graph? View Available Hint(s) The pulmonary aortic semilunar valve closes; blood is contained within the closed chamber, exerting pressure against the ventricular wall. The aortic semilunar valve closes; blood is contained within the closed chamber, exerting pressure against the ventricular wall. The tricuspid valve closes, blood is contained within the closed chamber, exerting pressure against the atrial wall. The bicuspid/mitral valve closes, blood is contained within the closed chamber, exerting pressure against the atrial wall. Submit
Ask by Greene Henry. in the United States
Jan 22,2025
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Answer
The second rise in left atrial pressure occurs when the **mitral valve** closes, trapping blood in the atrium and increasing pressure against the atrial wall.
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Beyond the Answer
The correct explanation for the second rise in atrial pressure on the graph is that the bicuspid (mitral) valve closes, which causes blood to be contained within the left atrium. This increased volume leads to an increase in pressure against the atrial wall. In terms of the heart's operation, understanding this change in pressure is crucial as it illustrates how the heart maintains efficient blood flow and prevents backflow during the pumping cycle. It's fascinating how each valve operates in a concerted rhythm to keep our circulatory system running smoothly like a well-oiled machine!
