. Biophysical science. Biophysics. 164 Mechanical and Electrical Character of the Heartbeat /9 : 4 person hears through a stethoscope. The two can be made quite similar by differentiating the sonograph output Aortic Pressure Ventricular Pressure ^i-Auricular Pressure Ventricular Volume Electro- cardiogram Heart Sounds Systole Diastole Figure 5. Pressure sequences in the left side of the heart. The significance of the vertical lines is as follows: 1. the mitral valve closes; 2. the semilunar valve opens; 3. the systolic pressure reaches a maximum; 4. the semilunar valve closes; 5. the m
. Biophysical science. Biophysics. 164 Mechanical and Electrical Character of the Heartbeat /9 : 4 person hears through a stethoscope. The two can be made quite similar by differentiating the sonograph output Aortic Pressure Ventricular Pressure ^i-Auricular Pressure Ventricular Volume Electro- cardiogram Heart Sounds Systole Diastole Figure 5. Pressure sequences in the left side of the heart. The significance of the vertical lines is as follows: 1. the mitral valve closes; 2. the semilunar valve opens; 3. the systolic pressure reaches a maximum; 4. the semilunar valve closes; 5. the mitral valve opens; 6. end of heart sound; and 7. the auricle starts to contract. After C. H. Best and N. B. Taylor, The Physiological Basis of Medical Practice, 7th ed. (Baltimore, Md.: Williams and Wilkins Company, 1961). B. Electrical Events The heart pulses rhythmically and with a definite sequence. The beat is initiated at the sino-auricular (s-a) node, shown in Figure 4. The node acts in a fashion similar to a relaxation oscillator putting out an electrical pulse (about every -^ of a minute in man). This pulse spreads. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ackerman, Eugene, 1920-. Englewood Cliffs, N. J. , Prentice-Hall
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