. Biophysical science. Biophysics. Pulmonary Vein Left Auricle Incomplete Septum (a) (b) Figure 3. Diagrams offish and reptile hearts, (a) Fish heart. The muscular walls develop successively higher pressures in the sinus venosus, auricle, and finally ventricle, (b) Reptile heart. Note the incomplete septum allowing mixing of blood from both auricles within the ventricle. Superior Vena Cava Aorta from Head to Body and Neck Pulmonary Artery to Lungs Semilunar Valve S-A Node A-V Node Tricuspid Valve Pulmonary Valve. Inferior Vena Cava from Trunk and Limbs Pulmonary Vein from Lungs Mitral Valve A-
. Biophysical science. Biophysics. Pulmonary Vein Left Auricle Incomplete Septum (a) (b) Figure 3. Diagrams offish and reptile hearts, (a) Fish heart. The muscular walls develop successively higher pressures in the sinus venosus, auricle, and finally ventricle, (b) Reptile heart. Note the incomplete septum allowing mixing of blood from both auricles within the ventricle. Superior Vena Cava Aorta from Head to Body and Neck Pulmonary Artery to Lungs Semilunar Valve S-A Node A-V Node Tricuspid Valve Pulmonary Valve. Inferior Vena Cava from Trunk and Limbs Pulmonary Vein from Lungs Mitral Valve A-V Bundle Complete Septum Figure 4. Diagram of the human heart. Arrows show direc- tion of blood 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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