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The heart of non-crocodilian reptiles has two atria supplying the ventricle from the systemic and pulmonary circulations.
 

Summary: The heart of non-crocodilian reptiles has two atria supplying
the ventricle from the systemic and pulmonary circulations.
The ventricle is not fully divided, but is compartmentalised
into the cavum dorsale and the cavum pulmonale by a muscular
ridge that runs from the apex to the base of the ventricle (Webb,
1979; Johansen and Burggren, 1980; van Mierop and Kutsche,
1985; Hicks, 1998). The cavum dorsale is further divided into
the cavum arteriosum (CA) and the cavum venosum (CV). The
pulmonary artery emerges from the cavum pulmonale (CP)
while the left and right aortic arches (LAo and RAo,
respectively) emerge from the CV. During ventricular diastole,
oxygen-poor blood from the right atrium (RAt) enters the CV
and flows across the muscular ridge to enter the CP, while
oxygen-rich blood from the left atrium directly fills the CA.
Oxygen-poor blood that remains within the CV by onset of
ventricular systole will be recirculated into the systemic
circulation (right-to-left shunt), whereas oxygen-rich blood
that may remain at this site by the start of ventricular diastole
can be carried to the CP and recirculated into the pulmonary
circulation (left-to-right shunt). This mechanism is normally

  

Source: Altimiras, Jordi - Department of Biology, Linköpings Universitet

 

Collections: Environmental Sciences and Ecology