Explain the mechanism of circulation in amphibians.

Amphibians have a closed circulatory system with a three-chambered heart that consists of two atria and one ventricle. The circulation in amphibians follows a double circulation pattern, which includes pulmonary circulation and systemic circulation.

Deoxygenated blood from the body enters the right atrium through the sinus venosus. Simultaneously, __________ ____ ___ ___ ________ ____ ____ __________.
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