. Comparative animal physiology. Physiology, Comparative; Physiology, Comparative. Circulation of Body Fluids 543 cessive chambers. The sequence of contraction is essentially similar in both the two-sided (4- or 3-chambered) and one-sided (2-chambered) hearts. During ventricular contraction, while the aortal (semilunar) valves are open, the aorta fills and the heart empties; ventricular systole (contraction) stops. 12 3 456 7 ^ Fig. 197. Correlated events of the cardiac cycle. Venous pulse, ele^)cardiogram, and heart sounds in man; aortic pressure, auricular pressure, ventricular pressure, and
. Comparative animal physiology. Physiology, Comparative; Physiology, Comparative. Circulation of Body Fluids 543 cessive chambers. The sequence of contraction is essentially similar in both the two-sided (4- or 3-chambered) and one-sided (2-chambered) hearts. During ventricular contraction, while the aortal (semilunar) valves are open, the aorta fills and the heart empties; ventricular systole (contraction) stops. 12 3 456 7 ^ Fig. 197. Correlated events of the cardiac cycle. Venous pulse, ele^)cardiogram, and heart sounds in man; aortic pressure, auricular pressure, ventricular pressure, and ven- tricular volume adapted from the dog. 1, Closure of the AV valves and beginning of ventricular contraction; 2, opening of aortic valves; 2-3, maximal ejection phase; 3-4, reduced ejection phase; 4-5, protodiastolic phase with closure of aortic valves at 5; 5-6, isometric relaxation, opening of A-V valves at 6; 6-7, rapid filling; 7 to auricular systole is phase of diastasis. Time marks at sec. on venous pulse curve apply to lower three curves. From ;^ when ventricular pressure falls below that of the aorta, then the aortal valves close (Fig. 197). During ventricular contraction the auricular pressure is below that in the ventricle and the auriculoventricular valves remain closed; as the auricles fill their pressure gradually rises while the ventricular pres- sure is falling, the auriculoventricular valves then open, blood enters the. 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 Prosser, C. Ladd (Clifford Ladd), 1907-; Bishop, David W. Philadelphia, Saunders
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