Answer:
The total amount of energy remains the same during the transformation.
Explanation:
The two atria are thin-walled chambers that receive blood from the veins. The two ventricles are thick-walled chambers that forcefully pump blood out of the heart. The right atrium receives deoxygenated blood from systemic veins; the left atrium receives oxygenated blood from the pulmonary veins.
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The sum of all vital processes by which food energy is made available to be used by the body.