Key result
Three-chambered snake hearts prevent extensive arterial-venous blood mixing with ventricular dynamics distinct from mammals.
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Our knowledge on the physiologic evolution of the cardiovascular system is fragmentary. The reptiles and the snakes in particular represent a stage where our knowledge is especially poor. The present study deals with the circulatory dynamics of the snake heart. It may be suggested that the snake heart effectively prevents extensive mixing of arterial and venous blood. The durations of ventricular filling and contraction differ greatly from that in the mammalian heart.
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Kjell Johansen (1959) studied Circulatory dynamics of the three-chambered snake heart. The three-chambered snake heart prevents extensive mixing of arterial and venous blood and exhibits ventricular filling and contraction durations that differ greatly from the mammalian heart.
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