three-chambered heart


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Related to three-chambered heart: Four chambered heart

three-cham·ber·ed heart

congenital abnormality in which there may be a single atrium with two ventricles or a single ventricle with two atria. Rudimentary parts of the atrial and ventricular septa may be present but are incompetent to prevent a virtual single chamber in either case.
References in periodicals archive ?
Reptiles, however, are cold-blooded and possess three-chambered hearts that pump cold blood to both the lungs and the body; their body temperature changes according to their external surroundings.
Other reptiles power their circulatory systems with three-chambered hearts.