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The image displays an open book, with text and a diagram on its pages. The text discusses the circulatory system and the cardiac cycle, including specific terms like "atrial systole," "ventricular systole," and "diastole." A pie chart diagram illustrates the different phases of a cardiac cycle, with durations such as "Atrial systole 0.1 sec," "Ventricular systole 0.3 sec," and "Complete cardiac diastole 0.4 sec." The diagram is titled "Figure 5:14 Diagram of the stages of one cardiac cycle." There is also page numbering "63" and the heading "THE CIRCULATORY SYSTEM" visible. The setting appears to be indoors, likely a study area, with natural light illuminating the pages. The content of the book suggests an educational context, possibly for biology or anatomy students. There are no people visible in the image.
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