Which of the following classes of vertebrates possesses a heart composed of two atria and … — JAMB UTME

Which of the following classes of vertebrates possesses a heart composed of two atria and a single ventricle?

Amphibia

Amphibians possess a three-chambered heart consisting of two atria (left and right) and a single ventricle.

Recall the heart chamber configuration for vertebrate classes.

Pisces have 2 chambers, Amphibia have 3 chambers, Reptiles have 3 (or partially divided 4) chambers, while Aves and Mammalia have 4 chambers.

Heart structure complexity evolved progressively across vertebrate groups.

Match the specific 3-chamber structure (two atria and one ventricle) to the target class.

Amphibians possess two atria receiving blood and a single undivided ventricle.

Oxygenated blood from skin/lungs and deoxygenated blood from the body enter separate atria before pumping through a shared ventricle.

Comparative Vertebrate Heart Structure

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