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, oxygenated blood from the lungs and skin enters the left atrium. Both _______ __________ ___ _________ _____ ____ ____ _____.
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