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The image is a page from a textbook on anatomy and physiology. The page is mostly text, with two diagrams illustrating heart function. The text discusses electrocardiographs (ECG), heart sounds, blood pressure, and electrical changes in the heart. The diagrams show ventricular systole and diastole, and an electrocardiograph tracing. The page is numbered "64" and has the header "FOUNDATIONS OF ANATOMY AND PHYSIOLOGY". The text discusses various aspects of the heart's function, including the electrical impulses that control its contractions, the sounds produced by the heart valves, and the measurement of blood pressure. The diagrams visually represent the opening and closing of heart valves during different phases of the cardiac cycle and the waveform of an ECG. The visible text discusses concepts like P wave, QRS wave, T wave, systolic blood pressure, diastolic blood pressure, and the 'lubb' and 'dup' sounds of the heart.
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